Of course, aftermarket axles are recommended, and actually a requirement for us since we plan on racing this car on a regular basis, so we called the guys at Randy's Ring & Pinion for a set of hefty Yukon Units. Since our truck rear had an open differential and undesirable gear ratio, we also had the guys at Randy's set us up with a limited-slip unit and a set of 4.88s for hard launches. We considered a spool, but since this is a street car, the all-around drivability of a Sure Grip made more sense. A bearing and shim kit and high-performance pinion yoke completed our order from Randy's, and we were ready to begin fabricating our housing.

Narrowing a rearend housing, while evoking thoughts of complicated geometry and mathematics, is actually easier than you think. The tooling consists of a large piece of solid bar stock and three aluminum discs. Since we're cheap, and because our friend Lonnie over at Harrell's Automotive already had the tool, we just borrowed it from him. After cutting the ends of the truck housing to length, two of the aluminum discs are bolted where the carrier bearing races would go. The bar is then inserted, and the third disc fits into the Mopar axle tube end, keeping it square as it's welded in place.

The only problem we encountered was when Associate Editor Kevin "Hacksaw" Shaw inadvertently cut one of our axle tubes too short. While this did suck, it was quickly remedied by ordering a length of axle tubing from Randy's Ring & Pinion and welding it in place. Lesson? Measure twice, cut once!

After measuring and welding our new housing together, it was time to set up the Dana 60 with new bearings, gears, and our Sure Grip differential. If you've never set up a set of gears before, our recommendation is to get help from someone who has. Since improperly installing any of the components in a rear differential can lead to accelerated wear, noise, or, worse yet, catastrophic failure, we enlisted the help of friend Tod Struck at Inline Performance Specialist. Tod's company specializes in heavy-truck maintenance, so he is familiar with the procedures and has all the tools necessary to properly set up a Dana 60. In a short time, Tod had our Dana assembled and ready to install with all our fresh internals. This rear should easily handle the abuse we'll give it and should be the last rearend we ever put in our Charger.

Now if we just had a motor in our project car, we'd head to the track for some testing.