How many miles on the engine? Could be an oil pan gasket or the rear bearing main oil seal. I have the same issue but mine appears to be the oil pan gasket. You have to raise the engine a couple of inches to get clearance to remove the oil pan on the 4x4. I have heard you can use a jack and lift from below but that does not sound too safe to me. Not sure where you put the jack (s) for one thing. I do not have a engine lift or a tree with a stout limb so it looks like the local garage will install my genuine GM parts.
A forum community dedicated to all General Motors truck owners and enthusiasts. Come join the discussion about performance, lift kits, wheels, tires, modifications, troubleshooting, maintenance, and more!