Small Block Chevy TH400 Muscle & Classic Car Transmission Parts

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

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.

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

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!

The 454 big block Chevy is still a popular build option for when there is no replacement for displacement!

Small block Chevy V8 or the modern LS V8? Which one comes out on top as the best engine to swap into your ride?

Identify SBC heads using casting numbers, style tips, and year-by-year guides for your small block Chevy engine projects

Small block and big block Chevy engines were designed with two styles of water pumps, short and long. Before you purchase a new pump, it's important to determine which oneyou have.

The 4.8 LS engine is a salvage yard bargain vs the typical 5.3 or 6.0 LS and can still make great power for your LS swap needs.

Learn how to successfully upgrade the cooling system for a 400 small block Chevy. Read tips for installing a water pump and auxiliary coolant lines using fittings and fuel hoses.