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Ships within 48 hours · Estimated delivery Aug 8 - Aug 13
Speedmaster direct drums are designed to prevent slippage and are able to withstand strong shifts on high horsepower applications
These scoops give you that classic Hilborn-style look with a polished aluminum body
this transmission is built with premium materials and cutting-edge engineering to dominate on the track or off-road
you can get 25 to 50 HP from these Proform main bodies
GM TH400 Billet Aluminum 0.250" Oversize Intermediate Piston [5.867″] Speedmaster direct drums are designedAlmost 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.
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