Review on Enhance Performance with Proform 66668 Black Aluminum Differential Cover: Perfect Launch Logo & Bearing Cap Stabilizer Bolts for GM by Mark Estrada

The axle cover is very thick and very well made. It had a few holes on the glue from the pour, I had to use a high temp RTV to prep the surface before installing. The equipment provided COEXISTS!. Due to the extra thickness of the cover, the included screws weren't long enough, I had to go and buy new hardware (longer grade 8 screws) to compensate for the extra thickness. Never use the supplied stainless steel/rubber washers. They don't crush properly after up to 25 ft-lbs of torque. I had to loosen all the screws and replace them with regular washers. The company should provide the best mounting hardware like the ARP screw set. Otherwise it was a great match for my 1973 Camaro Z28/RS. I purchased the 66668 cover for the 8.5" axle with 10 bolts. So far no problems, leaks, noise etc. From the previous reviews the one that complained the most was the fitment. There was a magnet on the drain plug which I am not sure about I was happy.