4R100 4-Pinion Overdrive Planetary Housing # 389742. Made from 4140 HTSR billet steel.
- Housing is made from 4140 HTSR billet steel for high horsepower EXTREME applications
- No more exploding planets or spline failure
- Includes assembly pin to make needle bearing installation easy
- Pinion staking pins supplied, no welding required to retain pinion pin