Throughout the '60s and '70s, GM ... bolt and the 10-bolts also varied in size as well, using both 8.5-inch and 8.2-inch diffs. The 8.5 is by far the more desirable of the two because of the ...

The pinion shaft on the 8.5-inch 10-bolt has a diameter of 1.625 inches, the same as the GM 12-bolt. The diameter of the 12-bolt ring gear—at 8.875 inches—is .375 inch larger than the one in ...

Depending on who you ask, discussion of the GM 10-bolt can be a polarizing conversation ... See All 37 Photos 19We dressed the back of the ring gear with a fine file to make sure the mating ...

All too often the average enthusiast installs a killer engine into his Chevy only to find ... to have the proper rear gear. The plan here was to upgrade the 10-bolt in our pal Larry Richard's ...