Can anyone tell me the length of a drive shaft on a 3500 2nd gen. quad cab. Need to know the rear shaft length from center of u-joint cross to center of the cross on other end. Changeing my truck from a dana 70 to a dana 80 and unless I'm wrong the drive shaft length in the 3500 is 2" shorter than my 2500 rear driveshaft. Need to know BEFORE I start the swap over. Dont need any surprises