Dodge Durango Forum II

RPM at 60 mph, in OD, should be 1900 if you have the 3.92, less...

if you have the 3.55 IF you have the 5.2/5.9, don't know about the 4.7. There should be a tag on the rear axle, I think it's a metal tag under one of the cover bolts. As a last resort, lift the rear axle off the ground(after blocking the front wheel so it won't roll) and mark the driveshaft and then rotate the shaft(tranny in neutral), count the drive shaft rotations and the wheel rotations. The drive shaft will rotate almost 4 times for each wheel rotation if you have the 3.92, only 3.5 times for the 3.55.

Tim

Thu Jun 29