replace oil pump

I think it's about 3 to 4 hours labor time and I really couldn't say what the parts cost will be because there's too much variation between suppliers and dealers. You'll need the oil pump, oil and filter, oil pan gasket and cleaner and sealer. Here's our estimator link, I hope it's of some help to you: https://repairpal.com/estimator/chevrolet/suburban+2500 FYI: In my experience, the bearing clearances on these engines of the period were often set up too loose, probably for fuel economy reasons, and it's probably a good idea to check the bearings once the oil pan and pump are off. If you want to find a GM specialist, here's our directory link for you: https://repairpal.com/chevrolet-repair-in-bettendorf-iowa