Review on 🛡️ G2 Axle&Gear 40-2021AL Differential Cover: Maximum Protection for Your Vehicle's Differential by Shane Minter

Update August 2021: Great G2 diff covers, solid aluminum with good drain plug. I have bought three of these and installed them on my trucks, a 14 hole version on my K2500 swing axle and two different 10 hole versions on my K1500. G3 has attempted to address some of the issues others have noticed (my first cover only came with SAE bolts but required metric sizes) and now ships packages with both SAE and metric bolts. However, the supplied screws are still too short, regardless of the thread. This is a big oversight, you'll have to add another $20-$30 for good bolts and washers at Home Depot/Lowe's. The included cap screws are 5/16-18 x 1 inch (similar metric length) which is a suitable screw for the OEM steel differential cap. However, due to the thickness of the aluminum cover, you will need 5/16-18" x 1-1/4" cap screws.