{"title":"IAG Drivetrain Replacement Parts","description":"\u003cp\u003e\u003cstrong\u003eMore IAG parts:\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"\/collections\/iag\"\u003eAll IAG parts\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-wrx-2022\"\u003eWRX 2022+\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-wrx-2015-2021\"\u003eWRX 2015-2021\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-wrx-2008-2014\"\u003eWRX 2008-2014\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-wrx-2002-2007\"\u003eWRX 2002-2007\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-sti-2015-2021\"\u003eSTI 2015-2021\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-sti-2008-2014\"\u003eSTI 2008-2014\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-sti-2004-2007\"\u003eSTI 2004-2007\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-brz-2022\"\u003eBRZ 2022+\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-brz-2013-2020\"\u003eBRZ 2013-2020\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-gr86-2022\"\u003eGR86 2022+\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-covers-and-caps\"\u003eEngine Covers and Caps\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-air-oil-separator\"\u003eEngine Air Oil Separator\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-mounts\"\u003eEngine Mounts\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-camshafts-and-gears\"\u003eEngine Camshafts and Gears\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-fuel-lines\"\u003eFuel Lines\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-fuel-packages\"\u003eFuel Packages\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-mount-bushing\"\u003eEngine Mount Bushing\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-oil-control-devices\"\u003eEngine Oil Control Devices\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-suspension-coilovers\"\u003eSuspension Coilovers\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-pulleys\"\u003eEngine Pulleys\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-drivetrain-transmission-mounts\"\u003eDrivetrain Transmission Mounts\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-dress-up\"\u003eEngine Dress Up\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-intercoolers-top-mount\"\u003eIntercoolers Top Mount\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-oil-pans\"\u003eEngine Oil Pans\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-drivetrain-mounts\"\u003eDrivetrain Mounts\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-fuel-injectors\"\u003eFuel Injectors\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-turbo-brackets-and-turbo-blankets\"\u003eTurbo Brackets and Turbo Blankets\u003c\/a\u003e | \u003ca href=\"\/collections\/iag-engine-components\"\u003eEngine Components\u003c\/a\u003e\u003c\/p\u003e\u003cp\u003eShop IAG Drivetrain Replacement Parts. This collection brings together every IAG product we catalogue under Drivetrain Replacement Parts, in one place. Parts here can span many different vehicles, so use the fitment tags and notes on each product page to match the part to your car before ordering.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in IAG Drivetrain Replacement Parts?\u003c\/strong\u003e\u003cbr\u003eEvery IAG product in our catalogue tagged Drivetrain Replacement Parts. Because the range covers many vehicles and years, each product's own fitment tags and notes are the source of truth for whether it suits your car.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I pick the right drivetrain replacement parts part?\u003c\/strong\u003e\u003cbr\u003eMatch the part to your vehicle first - check the fitment tags and notes on the product page - then compare the options on specifications and what is included in the box. If a listing covers multiple configurations, make sure yours is the one selected before checkout.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere can I shop IAG parts by vehicle instead?\u003c\/strong\u003e\u003cbr\u003eThe full IAG collection is linked at the top of this page, and IAG also breaks the range down by vehicle - WRX 2022+, WRX 2015-2021, WRX 2008-2014, WRX 2002-2007, STI 2015-2021, STI 2008-2014 and more are all linked above.\u003c\/p\u003e","products":[{"product_id":"iag-6-speed-synchro-set-1st-3rd-brass-4th-6th-carbon-faced-brass-for-08-21-sti","title":"IAG 6 Speed Brass Synchro Set 1st - 3rd Brass \/ 4th - 6th Carbon Faced STI 08-21 | IAG-DRV-1040","description":"\u003cp data-start=\"178\" data-end=\"482\"\u003e\u003cstrong\u003eProduct Fitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"178\" data-end=\"482\"\u003e2008-2021 Subaru STI\u003c\/p\u003e\n\u003cp data-start=\"178\" data-end=\"482\"\u003eWhether you're rebuilding your Subaru 6-speed transmission or upgrading for smoother gear engagement, the IAG 6-Speed Synchro Package is the ideal solution. This kit includes upgraded synchronizers and baulk rings for enhanced shifting precision and long-term durability.\u003c\/p\u003e\n\u003cp data-start=\"484\" data-end=\"501\"\u003e\u003cstrong data-start=\"484\" data-end=\"501\"\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"503\" data-end=\"1218\"\u003e\n\u003cli data-start=\"503\" data-end=\"650\"\u003e\n\u003cp data-start=\"505\" data-end=\"650\"\u003e\u003cstrong data-start=\"505\" data-end=\"538\"\u003eComplete Synchro Upgrade Kit:\u003c\/strong\u003e\u003cbr data-start=\"538\" data-end=\"541\"\u003eIncludes synchros for all forward gears—1st through 6th—for a comprehensive rebuild or performance refresh.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"652\" data-end=\"884\"\u003e\n\u003cp data-start=\"654\" data-end=\"685\"\u003e\u003cstrong data-start=\"654\" data-end=\"683\"\u003eEnhanced Gear Engagement:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"688\" data-end=\"884\"\u003e\n\u003cli data-start=\"688\" data-end=\"784\"\u003e\n\u003cp data-start=\"690\" data-end=\"784\"\u003e1st, 2nd, and 3rd gear brass synchronizers provide consistent engagement and smooth shifting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"787\" data-end=\"884\"\u003e\n\u003cp data-start=\"789\" data-end=\"884\"\u003e4th, 5th, and 6th gear carbon-faced brass baulk rings reduce wear and improve high-RPM shifting\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"886\" data-end=\"1055\"\u003e\n\u003cp data-start=\"888\" data-end=\"1055\"\u003e\u003cstrong data-start=\"888\" data-end=\"940\"\u003eOEM-Style Reliability with Performance Benefits:\u003c\/strong\u003e\u003cbr data-start=\"940\" data-end=\"943\"\u003eCarbon-faced baulk rings are a proven OEM upgrade known for increased longevity and smoother gear transitions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1057\" data-end=\"1218\"\u003e\n\u003cp data-start=\"1059\" data-end=\"1218\"\u003e\u003cstrong data-start=\"1059\" data-end=\"1100\"\u003eIdeal for Rebuilds and Gear Upgrades:\u003c\/strong\u003e\u003cbr data-start=\"1100\" data-end=\"1103\"\u003ePopular among performance enthusiasts and professional builders upgrading Subaru GR and VA 6-speed transmissions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1284\" data-end=\"1297\"\u003e\u003cstrong data-start=\"1284\" data-end=\"1297\"\u003eIncludes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1299\" data-end=\"1396\"\u003e\n\u003cli data-start=\"1299\" data-end=\"1344\"\u003e\n\u003cp data-start=\"1301\" data-end=\"1344\"\u003e1st, 2nd, 3rd Gear Brass Synchronizer Set\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1345\" data-end=\"1396\"\u003e\n\u003cp data-start=\"1347\" data-end=\"1396\"\u003e4th, 5th, 6th Gear Carbon-Faced Brass Baulk Rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IAG","offers":[{"title":"Default Title","offer_id":42072166006880,"sku":"IAG-DRV-1040","price":789.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/IAG-6-Speed-Brass-Synchro-Set-1st-3rd-Brass-4th-6th-Carbon-Faced-STI-08-21-IAG-DRV-1040.jpg?v=1756740489"},{"product_id":"iag-performance-chromoly-transfer-gears-for-1-1-1-transmission-06-6-speed-sti","title":"IAG Chromoly Transfer Gears For 1.1:1 Transmission Subaru STI 06-21 | IAG-DRV-1010","description":"\u003ch3\u003eProduct Fitment: \u003c\/h3\u003e\n\u003cp\u003e2006-2021 Subaru STI\u003c\/p\u003e\n\u003cp data-start=\"334\" data-end=\"658\"\u003eThe IAG Chromoly Transfer Gear Set is the ultimate upgrade for high-powered Subaru STI builds. Designed to eliminate one of the most common STI 6-speed weak points-the output shaft-it’s engineered to endure brutal launches and deliver long-lasting drivetrain performance. Ideal for track, drag, and high-torque applications.\u003c\/p\u003e\n\u003ch3 data-start=\"660\" data-end=\"677\"\u003eFeatures:\u003c\/h3\u003e\n\u003cul data-start=\"679\" data-end=\"1396\"\u003e\n\u003cli data-start=\"679\" data-end=\"834\"\u003e\n\u003cp data-start=\"681\" data-end=\"834\"\u003e\u003cstrong data-start=\"681\" data-end=\"711\"\u003eChromoly Gear Construction\u003c\/strong\u003e\u003cbr data-start=\"711\" data-end=\"714\"\u003eMade from ultra-durable chromoly steel to improve gear strength, hardness, and resistantce to twisting under high load.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"836\" data-end=\"988\"\u003e\n\u003cp data-start=\"838\" data-end=\"988\"\u003e\u003cstrong data-start=\"838\" data-end=\"872\"\u003eReinforced Output Shaft Design\u003c\/strong\u003e\u003cbr data-start=\"872\" data-end=\"875\"\u003eFeatures increased shaft diameter and lengthened, enlarged splines for maximum strength at the yoke connection.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"990\" data-end=\"1096\"\u003e\n\u003cp data-start=\"992\" data-end=\"1096\"\u003e\u003cstrong data-start=\"992\" data-end=\"1020\"\u003eTrack-Proven Reliability\u003c\/strong\u003e\u003cbr data-start=\"1020\" data-end=\"1023\"\u003eTested on 1200 WHP \/ 800 WTQ Subaru drag builds weighing over 3000 lbs.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1098\" data-end=\"1260\"\u003e\n\u003cp data-start=\"1100\" data-end=\"1260\"\u003e\u003cstrong data-start=\"1100\" data-end=\"1141\"\u003eOptimized for Aftermarket Driveshafts\u003c\/strong\u003e\u003cbr data-start=\"1141\" data-end=\"1144\"\u003eDesigned to work with performance driveshafts like those from Driveshaft Shop or ACPT (required for installation).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1262\" data-end=\"1396\"\u003e\n\u003cp data-start=\"1264\" data-end=\"1396\"\u003e\u003cstrong data-start=\"1264\" data-end=\"1302\"\u003eHeavy-Duty U-Joint \u0026amp; Yoke Assembly\u003c\/strong\u003e\u003cbr data-start=\"1302\" data-end=\"1305\"\u003eIncludes upgraded yoke and serviceable U-joint with snap rings for long-term reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1398\" data-end=\"1420\"\u003eGear Set Includes:\u003c\/h3\u003e\n\u003cul data-start=\"1422\" data-end=\"1544\"\u003e\n\u003cli data-start=\"1422\" data-end=\"1446\"\u003e\n\u003cp data-start=\"1424\" data-end=\"1446\"\u003eChromoly Driven Gear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1447\" data-end=\"1472\"\u003e\n\u003cp data-start=\"1449\" data-end=\"1472\"\u003eChromoly Output Shaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1473\" data-end=\"1490\"\u003e\n\u003cp data-start=\"1475\" data-end=\"1490\"\u003eUpgraded Yoke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1491\" data-end=\"1513\"\u003e\n\u003cp data-start=\"1493\" data-end=\"1513\"\u003eHeavy-Duty U-Joint\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1514\" data-end=\"1544\"\u003e\n\u003cp data-start=\"1516\" data-end=\"1544\"\u003eU-Joint Outside Snap Rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1546\" data-end=\"1558\"\u003eFitment Notes:\u003c\/h3\u003e\n\u003cul data-start=\"1560\" data-end=\"1838\"\u003e\n\u003cli data-start=\"1623\" data-end=\"1648\"\u003e\n\u003cp data-start=\"1625\" data-end=\"1648\"\u003e\u003cstrong data-start=\"1625\" data-end=\"1640\"\u003eGear Ratio:\u003c\/strong\u003e 1.1:1\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1649\" data-end=\"1743\"\u003e\n\u003cp data-start=\"1651\" data-end=\"1743\"\u003e\u003cstrong data-start=\"1651\" data-end=\"1660\"\u003eNote:\u003c\/strong\u003e Requires compatible aftermarket driveshaft (Driveshaft Shop or ACPT recommended)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1744\" data-end=\"1838\"\u003e\n\u003cp data-start=\"1746\" data-end=\"1838\"\u003e\u003cstrong data-start=\"1746\" data-end=\"1760\"\u003eImportant:\u003c\/strong\u003e Gear whine is normal due to dog-style engagement; not indicative of a defect.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-start=\"1840\" data-end=\"1862\"\u003eReplacement Parts:\u003c\/h3\u003e\n\u003cul data-start=\"1864\" data-end=\"1984\"\u003e\n\u003cli data-start=\"1864\" data-end=\"1984\"\u003e\n\u003cp data-start=\"1866\" data-end=\"1984\"\u003eU-joint and yoke are wear items-check regularly for competition vehicles. Replacement Kit available (PN# IAG-RPL-1000)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IAG","offers":[{"title":"Default Title","offer_id":42072167612512,"sku":"IAG-DRV-1010","price":1499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/IAG-Chromoly-Transfer-Gears-For-1_11-Transmission-Subaru-STI-06-21-IAG-DRV-1010.jpg?v=1756740582"},{"product_id":"iag-competition-series-transmission-shift-finger-with-spring-pin-for-04-21-subaru-sti","title":"IAG Competition Series Transmission Shift Finger with Spring Pin Subaru STI 04-21 | IAG-DRV-1043","description":"\u003ch3\u003eProduct Fitment:\u003c\/h3\u003e\n\u003cp\u003e2004-2021 Subaru STI\u003c\/p\u003e\n\u003cp data-start=\"310\" data-end=\"633\"\u003eWhile the Subaru STI 6-speed transmission is widely respected for its strength, one of its weak links is the factory shift finger. A failure of this small component can cause major issues. The IAG Shift Finger is designed as a robust solution, made from high-grade materials to ensure long-term reliability and performance.\u003c\/p\u003e\n\u003ch3 data-start=\"635\" data-end=\"652\"\u003eFeatures:\u003c\/h3\u003e\n\u003cul data-start=\"654\" data-end=\"1429\"\u003e\n\u003cli data-start=\"654\" data-end=\"821\"\u003e\n\u003cp data-start=\"656\" data-end=\"821\"\u003e\u003cstrong data-start=\"656\" data-end=\"677\"\u003eStronger Than OEM\u003c\/strong\u003e\u003cbr data-start=\"677\" data-end=\"680\"\u003eReinforced design provides greater resistantce to flex and fatigue, helping prevent transmission issues during aggressive driving or racing.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"823\" data-end=\"988\"\u003e\n\u003cp data-start=\"825\" data-end=\"988\"\u003e\u003cstrong data-start=\"825\" data-end=\"855\"\u003eA2 Tool Steel Construction\u003c\/strong\u003e\u003cbr data-start=\"855\" data-end=\"858\"\u003eMade from premium AISI A2 air-hardening tool steel for superior strength, wear resistantce, and dimensional stability under heat.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"990\" data-end=\"1163\"\u003e\n\u003cp data-start=\"992\" data-end=\"1163\"\u003e\u003cstrong data-start=\"992\" data-end=\"1029\"\u003eOEM Fitment with No Modifications\u003c\/strong\u003e\u003cbr data-start=\"1029\" data-end=\"1032\"\u003eInstalls directly into the STI 6-speed gearbox using the included FHI spring pin-no machining or internal modifications required.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1165\" data-end=\"1292\"\u003e\n\u003cp data-start=\"1167\" data-end=\"1292\"\u003e\u003cstrong data-start=\"1167\" data-end=\"1193\"\u003ePrecision CNC Machined\u003c\/strong\u003e\u003cbr data-start=\"1193\" data-end=\"1196\"\u003eManufactured in-house in Westminster, MD, with tight tolerances for exact fit and performance.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1294\" data-end=\"1429\"\u003e\n\u003cp data-start=\"1296\" data-end=\"1429\"\u003e\u003cstrong data-start=\"1296\" data-end=\"1315\"\u003eMade in the USA\u003c\/strong\u003e\u003cbr data-start=\"1315\" data-end=\"1318\"\u003eBacked by IAG’s reputation for high-quality Subaru performance products and expert US-based customer support.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IAG","offers":[{"title":"Default Title","offer_id":42072168005728,"sku":"IAG-DRV-1043","price":279.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/IAG-Competition-Series-Transmission-Shift-Finger-with-Spring-Pin-Subaru-STI-04-21-IAG-DRV-1043.jpg?v=1751627114"},{"product_id":"iag-1st-6th-carbon-synchro-set-for-2004-early-2006-subaru-sti-6-speed","title":"IAG 1st - 6th Carbon Synchro Set Subaru STI 2004 - Early 2006 6-Speed | IAG-DRV-1045","description":"\u003ch3\u003eProduct Fitment: \u003c\/h3\u003e\n\u003cp\u003e2004 - Early 2006 6-Speed Subaru STI\u003c\/p\u003e\n\u003cp data-end=\"499\" data-start=\"263\"\u003eRebuilding your STI’s transmission or experiencing gear grinding and rough shifts? IAG’s Carbon Synchro Set is engineered to enhance performance, improve shift quality, and extend transmission life for your 2004–2006 Subaru STI 6-speed.\u003c\/p\u003e\n\u003ch3 data-end=\"518\" data-start=\"501\"\u003eFeatures:\u003c\/h3\u003e\n\u003cul data-end=\"1201\" data-start=\"520\"\u003e\n\u003cli data-end=\"642\" data-start=\"520\"\u003e\n\u003cp data-end=\"642\" data-start=\"522\"\u003e\u003cstrong data-end=\"546\" data-start=\"522\"\u003eComplete Synchro Set\u003c\/strong\u003e\u003cbr data-end=\"549\" data-start=\"546\"\u003eIncludes carbon synchros for 1st through 6th gear—no need to mix OEM and aftermarket parts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"781\" data-start=\"644\"\u003e\n\u003cp data-end=\"781\" data-start=\"646\"\u003e\u003cstrong data-end=\"679\" data-start=\"646\"\u003eDual Carbon Friction Surfaces\u003c\/strong\u003e\u003cbr data-end=\"682\" data-start=\"679\"\u003eImproves engagement, reduces wear on sleeves and gear teeth, and enables faster, smoother shifts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"921\" data-start=\"783\"\u003e\n\u003cp data-end=\"921\" data-start=\"785\"\u003e\u003cstrong data-end=\"816\" data-start=\"785\"\u003eJapanese Brass Construction\u003c\/strong\u003e\u003cbr data-end=\"819\" data-start=\"816\"\u003eHigh-quality brass allows for precise machining and exceptional durability under aggressive driving.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1054\" data-start=\"923\"\u003e\n\u003cp data-end=\"1054\" data-start=\"925\"\u003e\u003cstrong data-end=\"953\" data-start=\"925\"\u003eEnhanced Surface Contact\u003c\/strong\u003e\u003cbr data-end=\"956\" data-start=\"953\"\u003eMaximizes grip between synchro and gear for reduced shift times and improved driving experience.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1201\" data-start=\"1056\"\u003e\n\u003cp data-end=\"1201\" data-start=\"1058\"\u003e\u003cstrong data-end=\"1092\" data-start=\"1058\"\u003eBuilt for High-Performance Use\u003c\/strong\u003e\u003cbr data-end=\"1095\" data-start=\"1092\"\u003ePerfect for spirited driving, track days, or performance builds that demand better-than-OEM reliability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"1238\" data-start=\"1203\"\u003eWhy Upgrade to Carbon Synchros?\u003c\/h3\u003e\n\u003cul data-end=\"1409\" data-start=\"1240\"\u003e\n\u003cli data-end=\"1276\" data-start=\"1240\"\u003e\n\u003cp data-end=\"1276\" data-start=\"1242\"\u003eReduces gear grinding under load\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1310\" data-start=\"1277\"\u003e\n\u003cp data-end=\"1310\" data-start=\"1279\"\u003eExtends synchro and gear life\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1355\" data-start=\"1311\"\u003e\n\u003cp data-end=\"1355\" data-start=\"1313\"\u003eImproves shift feel and engagement speed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1409\" data-start=\"1356\"\u003e\n\u003cp data-end=\"1409\" data-start=\"1358\"\u003eHelps prevent long-term transmission housing damage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IAG","offers":[{"title":"Default Title","offer_id":42072168071264,"sku":"IAG-DRV-1045","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/IAG-1st-6th-Carbon-Synchro-Set-Subaru-STI-2004-Early-2006-6-Speed-IAG-DRV-1045.jpg?v=1756740605"},{"product_id":"iag-1st-6th-carbon-synchro-set-for-2008-21-subaru-sti-6-speed","title":"IAG 1st - 6th Carbon Synchro Set Subaru STI 2008-2021 | IAG-DRV-1044","description":"\u003ch3\u003eProduct Fitment: \u003c\/h3\u003e\n\u003cp\u003e2008-2021 Subaru STI\u003c\/p\u003e\n\u003cp data-start=\"268\" data-end=\"493\"\u003eUpgrade your Subaru STI’s transmission with IAG’s 1st-6th Carbon Synchro Set-designed for smoother shifting, enhanced durability, and optimal performance whether rebuilding your gearbox or installing a performance drivetrain.\u003c\/p\u003e\n\u003ch3 data-start=\"500\" data-end=\"519\"\u003eFeatures:\u003c\/h3\u003e\n\u003cul data-start=\"521\" data-end=\"1245\"\u003e\n\u003cli data-start=\"521\" data-end=\"694\"\u003e\n\u003cp data-start=\"523\" data-end=\"694\"\u003e\u003cstrong data-start=\"523\" data-end=\"563\"\u003eEnhanced Shift Quality \u0026amp; Reliability\u003c\/strong\u003e\u003cbr data-start=\"563\" data-end=\"566\"\u003eEliminates gear grinding and reduces wear on the transmission housing by replacing worn synchros with a full carbon-faced set.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"696\" data-end=\"839\"\u003e\n\u003cp data-start=\"698\" data-end=\"839\"\u003e\u003cstrong data-start=\"698\" data-end=\"740\"\u003eAdvanced Dual Carbon Friction Surfaces\u003c\/strong\u003e\u003cbr data-start=\"740\" data-end=\"743\"\u003eMaximizes surface contact for faster, more precise shifts under aggressive driving conditions.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"841\" data-end=\"982\"\u003e\n\u003cp data-start=\"843\" data-end=\"982\"\u003e\u003cstrong data-start=\"843\" data-end=\"888\"\u003eHigh-Strength Japanese Brass Construction\u003c\/strong\u003e\u003cbr data-start=\"888\" data-end=\"891\"\u003ePrecision-machined for durability and resistantce to wear, delivering a robust shift feel.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"984\" data-end=\"1123\"\u003e\n\u003cp data-start=\"986\" data-end=\"1123\"\u003e\u003cstrong data-start=\"986\" data-end=\"1015\"\u003eImproved Shift Engagement\u003c\/strong\u003e\u003cbr data-start=\"1015\" data-end=\"1018\"\u003eLarger friction surface area lowers shift force, providing a smooth, low-effort gear change experience.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1125\" data-end=\"1245\"\u003e\n\u003cp data-start=\"1127\" data-end=\"1245\"\u003e\u003cstrong data-start=\"1127\" data-end=\"1156\"\u003eComplete 1st-6th Gear Kit\u003c\/strong\u003e\u003cbr data-start=\"1156\" data-end=\"1159\"\u003eContains all required synchros-no need to source individual pieces or mix OEM parts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IAG","offers":[{"title":"Default Title","offer_id":42072197038176,"sku":"IAG-DRV-1044","price":549.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/IAG-1st-6th-Carbon-Synchro-Set-Subaru-STI-2008-2021-IAG-DRV-1044.jpg?v=1756740758"},{"product_id":"iag-performance-chromoly-transfer-gears-for-1-1-transmission-04-05-6-speed-sti","title":"IAG Performance Chromoly Transfer Gears For 1:1 Transmission Subaru STI 04-05 | IAG-DRV-1000","description":"\u003ch3\u003eProduct Fitment: \u003c\/h3\u003e\n\u003cp\u003e2004-2005 Subaru STI\u003c\/p\u003e\n\u003cp data-end=\"2247\" data-start=\"2236\"\u003e\u003cstrong\u003e\u003cem\u003eRequires:\u003c\/em\u003e\u003c\/strong\u003e Driveshaft Shop or ACPT driveshaft for proper fitmentt\u003c\/p\u003e\n\u003cp data-end=\"637\" data-start=\"274\"\u003eThe IAG Chromoly Transfer Gear Set is purpose-built to eliminate one of the biggest failure points in the STI 6-speed transmission-the output shaft. Designed for aggressive launches and high-horsepower applications, this upgraded gear set reinforces your drivetrain where it matters most, ensuring greater strength, reliability, and long-term performance.\u003c\/p\u003e\n\u003cp data-end=\"1107\" data-start=\"682\"\u003eUnder hard acceleration, the OEM output shaft in the STI can twist and eventually snap-especially where the driveshaft yoke connects. The IAG Transfer Gear Set solves this problem by increasing the diameter of the output shaft and enlarging and lengthening the splines. The redesigned parts are engineered to eliminate the weak links in the factory design, allowing the system to reliably handle extreme torque loads.\u003c\/p\u003e\n\u003cp data-end=\"1440\" data-start=\"1164\"\u003eThe gear set is \u003cstrong data-end=\"1222\" data-start=\"1180\"\u003eprecision-machined from Chromoly steel\u003c\/strong\u003e, a high-strength alloy known for its toughness and fatigue resistantce. This advanced material significantly improves torsional strength and durability, making it ideal for track, drag, and high-performance street use.\u003c\/p\u003e\n\u003ch3\u003eFeatures:\u003c\/h3\u003e\n\u003cul data-end=\"1985\" data-start=\"1465\"\u003e\n\u003cli data-end=\"1568\" data-start=\"1465\"\u003e\n\u003cp data-end=\"1568\" data-start=\"1467\"\u003e\u003cstrong data-end=\"1505\" data-start=\"1467\"\u003e1:1 Gear Ratio (For 2004-2005 STI)\u003c\/strong\u003e\u003cbr data-end=\"1508\" data-start=\"1505\"\u003eMatches the OEM ratio while delivering unmatched strength.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1670\" data-start=\"1570\"\u003e\n\u003cp data-end=\"1670\" data-start=\"1572\"\u003e\u003cstrong data-end=\"1597\" data-start=\"1572\"\u003eUpgraded Output Shaft\u003c\/strong\u003e\u003cbr data-end=\"1600\" data-start=\"1597\"\u003eEnlarged and lengthened splines reduce failure risk under high load.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1759\" data-start=\"1672\"\u003e\n\u003cp data-end=\"1759\" data-start=\"1674\"\u003e\u003cstrong data-end=\"1706\" data-start=\"1674\"\u003eHigh-Strength Chromoly Gears\u003c\/strong\u003e\u003cbr data-end=\"1709\" data-start=\"1706\"\u003eReinforced for sustained high-performance abuse.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1880\" data-start=\"1761\"\u003e\n\u003cp data-end=\"1880\" data-start=\"1763\"\u003e\u003cstrong data-end=\"1797\" data-start=\"1763\"\u003eAftermarket Yoke Compatibility\u003c\/strong\u003e\u003cbr data-end=\"1800\" data-start=\"1797\"\u003eDesigned to work with \u003cstrong data-end=\"1843\" data-start=\"1824\"\u003eDriveshaft Shop\u003c\/strong\u003e or \u003cstrong data-end=\"1855\" data-start=\"1847\"\u003eACPT\u003c\/strong\u003e performance driveshafts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1985\" data-start=\"1882\"\u003e\n\u003cp data-end=\"1985\" data-start=\"1884\"\u003e\u003cstrong data-end=\"1931\" data-start=\"1884\"\u003eTested on 1200 WHP\/800 WTQ Subaru Drag Cars\u003c\/strong\u003e\u003cbr data-end=\"1934\" data-start=\"1931\"\u003eProven durability in extreme racing environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 data-end=\"2011\" data-start=\"1992\"\u003eIncluded:\u003c\/h3\u003e\n\u003cul data-end=\"2133\" data-start=\"2013\"\u003e\n\u003cli data-end=\"2037\" data-start=\"2013\"\u003e\n\u003cp data-end=\"2037\" data-start=\"2015\"\u003eChromoly Driven Gear\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2063\" data-start=\"2038\"\u003e\n\u003cp data-end=\"2063\" data-start=\"2040\"\u003eChromoly Output Shaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2081\" data-start=\"2064\"\u003e\n\u003cp data-end=\"2081\" data-start=\"2066\"\u003eUpgraded Yoke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2104\" data-start=\"2082\"\u003e\n\u003cp data-end=\"2104\" data-start=\"2084\"\u003eHeavy-Duty U-Joint\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2133\" data-start=\"2105\"\u003e\n\u003cp data-end=\"2133\" data-start=\"2107\"\u003eU-Joint Outside Snap Rings\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong data-end=\"2333\" data-start=\"2324\"\u003eNote:\u003c\/strong\u003e This kit may produce some drivetrain \"whine\" due to the performance gear engagement style. This is normal and expected in high-performance setups.\u003c\/p\u003e","brand":"IAG","offers":[{"title":"Default Title","offer_id":42072197562464,"sku":"IAG-DRV-1000","price":1499.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/IAG-Performance-Chromoly-Transfer-Gears-For-11-Transmission-Subaru-STI-04-05-IAG-DRV-1000.jpg?v=1751492497"}],"url":"https:\/\/www.importimageracing.com\/collections\/iag-drivetrain-replacement-parts.oembed","provider":"Import Image Racing","version":"1.0","type":"link"}