I have a 2004 Tahoe RPO codes GT4, G80. So I think that means I have the 3.73 rear end. I have to two my mom's 2002 Explorer to Chicago from Dallas. Going to rent a u-haul trailer. This is a long tow. I have the tow package, but this rig has never towed anything. I've always kept up on my fluid changes. Has anyone else towed this heavy on a long trip? Explorer is 5200lbs. One the way back I'm towing a classic 1990 Fleetwood. Tahoe has 213k miles, runs and shifts like new. New shocks and water pump. Will be doing the brakes this week.