Ford C4 Transmission Performance 8 Pinion 2.20 Ratio First Gear Planetary Gear Set Convert any one-piece GM TH400

Convert any one-piece GM TH400 case into a two-piece case with our Speedmaster TH400 case adapter

They are engineered to be "where the oil is" under the most demanding racing conditions

or working on your current shifter assembly

Put together your own custom exhaust system with these Speedmaster collector reducers

Ford C4 Transmission Performance 8 Pinion 2.20 Ratio First Gear Planetary Gear Set Convert any one-piece GM TH400Speedmaster offers the maximum strength 8 pinion planetary gearset. Our 2. 20 gearset are assembled with Torrington bearings to replace the factory spec thrust washers, which reduces the friction, heat, and stress that the planetary gearset is subject to.