The Speedmaster PCE634.1007 is a full manual valve body designed for the GM TH400 automatic transmission, featuring an extended transbrake for maximum launch control on the strip. Machined from billet aluminum, this valve body delivers precise, driver-commanded gear selection with no automatic upshifts, putting total control in the driver's hands for consistent, repeatable performance.
The integrated transbrake function allows the driver to simultaneously apply forward and reverse clutch packs, building maximum torque converter stall and releasing it for explosive launches. Engineered as a direct-fit upgrade for TH400-equipped vehicles, this valve body is an ideal choice for drag racers and performance enthusiasts looking to extract every advantage from their TH400-based drivetrain.
