Car Craft
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Rear Gear Swap

Easy Bolt-On

Photography by John Kiewicz

In the Nov. 1998 CC you read about a real-world street machine buildup using a 1970 Duster. As part of the story, we shoehorned in a stout 360 V-8 and an 8 3/4 rearend. The rear came with an open diff and 3.23:1 gears, but we perused the classifieds and found a rearend pig loaded with a limited-slip (Sure-Grip) differential and steep 4.30:1 gears. Installing a new centersection in a Mopar 8:3/4 rear, Ford 8- or 9-inch rear, or early-style (1955-1964) GM 10-bolt is easy--the job is similar for all those diffs--and it can be done in an afternoon. There are a few special tools and tricks to properly performing the work, and that’s exactly what this story is about--showing you what’s really needed to do a swap.

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