Chevy TH400 Automatic Transmission Parts

This resource contains a transmission pan shape ID chart and other tips to help with identifying GM transmissions.

Concerned about a transmission swap? Our engine transmission compatibility checker will help confirm what you need to make it happen.

The LS swap is no doubt still going strong, but if you’re planning to run an automatic behind your 4.8, 5.3, or 6.0L LS-powered ride, you’ll need to pay attention to a few items we discuss in this buyer’s guide.

Learn how to install a side detent shifter in a 1969 Chevy C10.

Learn how Zach replaces a transmission and breakaway converter in his 55 Chevy, with some helpful tips along the way.

The 700R4 is a great choice when it's time to upgrade your classic car or truck with an overdrive transmission. Here's what you need to know about GM's famous 4-speed automatic.

How to plan and execute a LS swap into any 1973-1987 Chevy/GMC K10 pickup truck.

Over several generations of small block Chevy (and big block Chevy) engines there have been several changes that dictate what flexplate works with them. We’ll help you determine the correct flexplate for your Chevy engine in this buyer’s guide.

We finally get to drive Project Chevelle after the big engine swap, and it's pretty awesome. Rowing through the gears with our new Tremec 5-speed isn't bad either!

Decode small block Chevy engine suffix codes and block casting numbers with our SBC decoding info guide. Learn how to find and decipher your small block Chevy engine codes quickly and easily!