GM TH400 Transmissions & Transmission Parts

If you're working on a classic restoration, restomod, or racing build, ensuring you have a transmission that's working great and can handle your intended levels of power is absolutely critical. Tier One's built TH400 transmissions can handle a ton of power and tough racing applications both on the street and out on the dirt. Our selection of TH400 performance transmissions come with upgraded internal components that can hold a bunch of power while still offering smooth shifting and excellent levels of reliability. Our built TH400 transmissions are perfect for restoration projects, road racing, circle track racing, drag racing, or purpose-built off-road trucks. Also check out our TH400 rebuild kits or our TH350 built transmissions! Contact Tier One with questions or for custom builds!