J Wondering,DO NOT USE ANYTHING BUT A SYNTHEDIC OIL IN THE REARENDS.If you dont go buy the book & something happens durying warrenty you can kiss the warrenty good bye cause GM wont stand in back of it.If anything take it in to your dealer & have it done right with the right oil.At least have GM maintain it untill the warrenty is gone.That way if something goes wrong theyll have to stand in back of it cause there the only one that did work on it.Too much money up front to take any chances with these trucks.Hammer [img]smile.gif[/img] [img]smile.gif[/img]
[URL=http://2001 3500 LS Extended Cab D/A ,Running Boards.Tool Box,Window Shades,Bug Deflector,20K Reese Fifth Wheel Hitch,K&N Air Filter,Running Board Lights,Blue Grill Lights.Chrome Tailpipe Extension,Computered Trailer Brake System, Pulling 2001 Travel Supreme Exspress 36 Ft. Tri-Axle fully loaded.<br />Total Weight-26,500