TH350 & TH400

TH400 Transmission Parts and Adapters

The strong, durable, and versatile design of the TH400 has made it a legend in the 4x4 community. If you are looking to swap your OEM transmission for a TH400, you can find the right parts at Advance Adapters. We design and manufacture TH400 adapters and other accessories for a seamless conversion. These parts also let you upgrade a transfer case in a vehicle already containing a TH400.

Get a TH400 to Atlas adapter, a TH400 to D300 adapter, and other connectors to mate your drivetrain components. Advance Adapters also remanufactures the GM TH400 to NP205 adapter based on OEM specifications. With a TH400 conversion kit, you will experience the best performance for heavy-duty applications.

About the TH400

Designed to handle the stresses of giant GM passenger vehicles in the 1960s, the Turbo-Hydramatic 400 remains in demand. This three-speed automatic transmission appeared in many Oldsmobile, Buick, Chevrolet, and Pontiac vehicles from the 1960s to the early 1990s. Jeep also used the TH400 in the original Jeep Gladiator and Wagoneer. You can learn more about the GM TH400 in our Tech Vault Knowledge Base, including the gear ratios and how to identify the transmission.

A GM TH400 swap kit and the right transfer case let you experience the transmission’s ruggedness for off-roading, towing, and more. We also offer replacement gated shifters, transmission cooler lines, adjustable shift arms, and other parts you may need. The four-wheel drive experts at Advance Adapters are here to assist with your conversion. Use the contact form or call us toll-free at 800-350-2223.