When it comes to modifying your Mopar, oftentimes you’re left trekking through uncharted territory. Thankfully, with the advent of the internet researching how and whether a certain part will work or not has become demonstrably easier. In the case of using Wilwood rear brakes, those who know will tell you that one must use the “green” bearings. Unfortunately, most 8.75 axles are not 2.36″ offset as the “green” bearings require.
This means that, according to Reilly Motorsports, “the rotors will not fit over standard wheel studs, the back of the studs will also contact the parking brake, the center register is a different size, and you need an access hole in the flange to reach the retainer nuts.” Additionally, it’s probably the smarter route to just upgrade your 40-plus-year-old factory axles to handle the kind of power you’re making anyways.
Thankfully, the team at Reilly Motorsports (RMS) have partnered with Moser Engineering to make these unique heavy duty 30-spline axles with the correct offset. Not only that, but they come equipped with the “green” bearings and special low-clearance screw-in studs. Additionally, RMS had Moser change the length so that they will fit without removing the thrust block in the center, added an access hole, and added the correct-sized center register to fit the rotor!
And as you might expect from Moser, these axles are built-to-last anything you can throw at them, and allow for a true bolt-on process for a rear Wilwood brakes with the parking brake kit with no issues. It’s important to note that these axles are for stock-width housings, so if you think a custom length is required for your application, please make sure to call RMS to place a special order.