GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] these durable mounting blocks are

these durable mounting blocks are precision-machined from billet aluminum

Just bolt the pre-assembled unit to the back of the shifter and you are ready to go

They utilize O-ring sealing and are manufactured from high-quality billet aluminum

Pontiac Firebird

GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] these durable mounting blocks areAlmost 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.