Performance Automatic Super Comp Transmissions PA45102M-46

For a step up from a mild street build, the Performance Automatic Super Comp PA45102M-46 is a remanufactured 4-speed automatic rated to 950 horsepower, meant for racers rather than daily drivers. Lockup compatibility rides alongside a built-in trans-brake on a full manual valve body, with a 2.46 first gear ratio on a 35-spline input shaft.

Trans-brake and lockup together

Combining a trans-brake with lockup compatibility is less common than either feature alone, letting the transmission launch hard off a trans-brake button at the line while still locking the torque converter for efficient cruising between runs. The build starts from a core, then gets racing clutches, premium bands, and a hardened shaft, carrying that combination without sacrificing durability under repeated passes.

What to pair it with

The internals ride in an aluminum clutch hub, and the tailshaft runs a slip-on yoke at 10.000 inches, sitting alongside a deep aluminum pan for added fluid capacity on this Ford-bellhousing case. Because every shift, forward or reverse, runs through the full manual valve body, wiring for the trans-brake button and a compatible shifter are both part of planning the install, along with a lockup-capable torque converter to use that feature.

Is a torque converter included? No; it ships as the transmission alone, so a torque converter, flexplate, wiring, and cooler are all separate purchases.