i still have the stock 3.73 in it. i want a 4.10 though for towing purposes.nice! did you have to regear when going to 35? i need to regear but i was still able to tow 5000 up the colorado summit.... //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif