There are few things in the world of high-performance cars that are truly reliable. One would have to be the GM TH400 automatic. As durable as this three-speed juicebox is, there is still room for ...

For the price of the trans pan, valve body, and separator plate gaskets, the firmness and quickness of GM Turbo 400 upshifts and downshifts can be dramatically improved, according to Darrell Young's ...

In the 1960s, General Motors started manufacturing a new three-speed automatic transmission named the Turbo Hydra-Matic 400 (TH400) that saw first use in 1964. Commonly called the Turbo 400, it was so ...

Automatic transmissions are steadily gaining popularity in off-road vehicles. There are the few hard-core old guys (including our trusty leader) that won't do it with anything other than a stick shift ...