Performance Automatic TH400 Transmissions PA40101

The Performance Automatic TH400 Transmission PA40101 is a remanufactured 3-speed automatic built on a Chevy bellhousing pattern, rated for up to 500 horsepower and fitted with heavy-duty clutches and a TransGo shift kit already installed. An Automatic/Manual valve body and a 2.48 first gear ratio run through a 30-spline input shaft.

What the shift kit changes

A TransGo shift kit firms up shift feel and timing compared with a stock valve body, one of the more common upgrades on a TH400 and already done on this unit rather than left for the installer. A deep steel pan finished in chrome adds fluid capacity to support that firmer shifting, which puts more heat into the fluid than a stock valve body does.

Fitment and what ships separately

A 4.000-inch tailshaft carries a slip-on yoke on this case, so size your driveshaft to that length, and line up your bellhousing against the Chevy pattern before you commit to buying. No torque converter, flexplate, controller, wiring harness, or cooler ships with this transmission, so budget for those pieces as part of the overall install cost.

Is this a new transmission? No, it is remanufactured from a core and rebuilt to the specifications listed here, including the shift kit and heavy-duty clutches already installed at the factory rather than left for the buyer to add later.