TH400, GM 8.5 Inch 10-Bolt Parts

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

GM’s 10-bolt rear axle has been around since the 1960s, here’s how to determine if your junkyard find is worth taking home

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

If you're ready to swap an LS engine into you '73-'87 Squarebody Chevy or GMC truck, here's a guide to get you started and a parts list to help you get everything you need for your swap.