The clutches in a differential wear out ... See All 19 Photos 1This GM 12-bolt Posi unit isn't that scary, really. It's just a bunch of simple parts crammed into a small case.

It was 1973, the last time we saw a brand-new 12-bolt rearend in a passenger car, and man, the things are fetching untouchable green at today's swap meets. Some have argued that GM's 12-bolt axle ...

A fundamental part of any muscle car is a nice, strong rearend fitted with a limited slip or Posi ... on their Chevy. So for all the purists out there, we are going to rebuild a 12-bolt with ...

In this installment of the newest addition to the Super Chevy ... 12-bolt rearend. Shown is the Moser Engineering designed exciter ring, otherwise known as a reluctor ring, and an Eaton posi ...