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Rear Differential Pinion Seal - GM Truck Club Forum Before you replace the seal check to make sure the breather hose on the diff isn't plugged My truck was showing the same signs of leakage but before replaceing the seal I took the hose off to check it What I found was that the vent where it comes out of the diff was plugged with rust
12 bolt differential pinion seal replacement - The 1947 - Present . . . Mark the pinion nut's position before loosening and removing it 2 Install new seal 3 Install and tighten nut to the "exact point" that it was before you loosened it Check and fill with oil and you should be good to go Make sure to use a speedy sleeve on the yoke! A seal itself won't do much if the yoke is worn
12 Bolt car pinion seal - Team Chevelle It appears they are different size's, so if you drive the truck seal all the way in, you go beyond the sealing area in the pinion yoke and will leak It is suggested you leave the seal out about 1 8", which mine was
Changing a pinion seal on a 12 bolt Chevy rear end I neglected to make a scratch mark on the 1 1 8 nut when I spun it off the pinion flange of my Chevy 12 bolt rear Now I'm sticking a new pinion seal into it to replace the old one which developed a leak from sitting still for many years