GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] These performance planetary gear sets

These performance planetary gear sets are precision CNC-machined for precise gear alignment and consistent performance

So can features such as full ball-bearing construction

yet require less horsepower to turn

What's more

Valve stem seals control the lubrication of the valve stem as it slides in the valve guide

GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] These performance planetary gear setsAlmost 10% larger that stock intermediate piston, the increased diameter applies more clamping force on the second gear clutch pack. Reducing the possibility of driving through the clutches as the power curve comes on strong. The stock 5. 617 center support piston has be increased by 0. 250" to 5. 867 in diameter.