10/7/2023 0 Comments Built th400![]() The forward clutch hub of the GM TH400 has been known to break in competition applications or vehicles with over 1000 horsepower/1000 foot pounds of torque. We also install a Billet forward clutch hub. But durability is significantly increased. These modifications will also result in a much firmer apply into gear from neutral or park to reverse or drive. “Dished” cushion plates in these units are replaced with the TH400 style plates for additional reliability. The drums are then modified to accept additional frictions and the apply area itself is altered to allow use of the entire piston area for apply in the forward drum. The Forward and Direct clutch frictions are replaced with heavy duty performance frictions. This drum has been tested behind engines producing over 2000 horsepower/1800 foot pounds of torque. This drum uses factory OEM clutches and steels. Modified inner race distributes lube oil to the sprag assembly more efficiently. This custom drum assembly is fitted with oversize tool steel inner and outer sprag races, an oversize 36 element sprag assemblies, and a custom sprag retaining plate and spiral lock ring. Super Comp Direct clutch drum and 36 element oversized sprag. Then it is coated with a special heat and oil resistant paint making for a very tough finish and a clean look.īushings are replaced and sized as needed to performance specifications. The case is carefully inspected, cleaned and re-inspected. The unit is disassembled, each part carefully inspected and clearances are measured to meet our specifications not just the maximum clearance allowed by GM. The billet descriptions are from the manufacturer. The Heavy Duty line is available in both 2 and 4WD. Note the differences between the HD and Performance versions. Each of these units features all the latest upgrades and high quality materials for assembly. This is our strongest non-electronic transmission offering to date. Shipped only to Commercial/Business Locations
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