killian96ss wrote:I just recently put on a Summit aluminum differential cover with the bearing cap preload bolts and it also had the oiling holes blocked. What I did to correct this problem was put the gasket on the rear end with the cover off and lined up all 10 of the cover holes and pressed lightly on the gasket over the lubing holes to create an impression of the holes so that I could cut out the holes with an exacto knife. After I did this I laid the gasket on the new aluminum cover and marked the area that needed to cut out. I used a large half round file and made an oiling channel on each side that matched up with the holes I cut in the gasket. IMO this will provide more than adequate oiling for the wheel bearings. As an added benifit the cover has 600 tons of support and keeps the bearing caps from flexing or breaking when under load, and will definitely help protect the gears from rocks and stuff when off roading. It also looks very cool. I wish I had done some install pics for everyone to see, but if you want to see what the covers look like just go to Summit's web site and look up differential covers. Thses covers are very nice and come with the gasket and ARP 12 point stainless bolts for only $139. I think this is a great mod for improving the strength and reliability of the 10 bolt rear end. I hope this info is helpfull, and remember GM will deny that there is any problem at all which really sucks because it affects so many cars and trucks with the 10 bolt.
Link to thread in stock forum