they are the shop I use to replace and rebuild the diffs. with the 4.10 gears being installed....so they know the procedure pretty well, as well as the fact it is a differential only shop. They are:Hooper's Rear End Exchange at 818 899-2515 and ask for Anthony. Tell him Mark Leader said to call him. He will be able to help you out if you strike out on your other attempts. Good luck, Mark