IAG Chromoly Transfer Gears | 2004-2017 Subaru STI
Posted on 08 March 2017
Subaru STI Transfer Gear Set
The IAG Chromoly Transfer Gear Set is specifically engineered to strengthen the weak points in the STI 6 speed transmission. When a powerful STI launches aggressively at the track the output shaft progressively twists and weakens. After multiple launches, the output shaft breaks where the driveshaft yoke connects.
2004-2005 STI (IAG-DRV-1000)
IAG’s upgraded transfer gear set is capable of handling these immense loads by improving the gear material and redesigning the parts at the weakest points. The gears are manufactured from chromoly which is known for its improved hardness and strength. The output shaft diameter was increased and the splines were enlarged and lengthened then matched to an upgraded Spicer yoke designed to mate to an aftermarket performance driveshaft.
2006+ STI (IAG-DRV-1010)
- Much stronger over OEM
- Chromoly construction
- Increased output shaft diameter
- Tested on Subaru drag vehicles producing 1200 WHP/800 WTQ at 3000+ LBS