TH400 prioritizes maximum strength under load. Overdrive units cruise at lower RPM, but TH400 is the go-to for drag and heavy-duty use.
Yes—this SportMonster package ships with a matched torque converter.
Ensure strong cooler flow, fresh lines, and consider an auxiliary cooler and deep pan for heat control.
Jump to: Cooling & fluid • Converter matching • Gearing with non-OD • Install checklist
Heat is the enemy. Flush or replace the cooler and lines, verify strong return flow, and use a low-restriction auxiliary cooler for heavy use or hot climates. Run fresh, high-quality ATF per builder guidance and recheck level at temperature.
Stall that’s too low can lug the combo; too high overheats. We include a matched converter based on weight, rear gear, tire, and engine torque curve for crisp launches and drivability.
TH400 is a robust 3-speed. Choose rear gears with cruise rpm and tire size in mind. For mixed street/strip, a balanced rear gear avoids excessive cruise rpm while keeping the engine in its happy range out of the hole.
No external TCM learn required. Ensure kickdown switch/solenoid wiring is correct if your vehicle uses it.
Use a high-quality ATF suitable for your build and climate. We can advise based on your use case.
We’ll select stall and build details from your engine torque, weight, gears, tire, and intended use.
