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Swappin' Gears

A 12-bolt behind an overdrive gets some low-end punch

The quest for all-around performance can be accomplished in a variety of ways. The owner of this particular vehicle initially chose a Gear Vendors overdrive unit that literally gave him six forward speeds. It worked great, but he then decided that he'd like a bit more punch off the line and in in-town driving. To accomplish this he dropped the truck off at the Diff Works in Riverside, California, for a gear change and Posi upgrade. The truck was originally equipped with a 3.07:1 ratio, but the owner chose to install 3.78s for that little extra low-end punch. I happened to be in the right place at the right time so I was able to chronicle the swap and show you how the professionals perform a rearend upgrade with a small pile of high-quality aftermarket performance parts. Check it out.

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Super Chevy