I was helping a buddy get a new rearend for his tahoe. His ratio is 3.42. The first rearend we checked, i turned the outside wheel drum one complete turn, the driveshaft turned approx 3.75 turns so as written with paint it stated 3.73. The next one we looked at, we did the same, BUT the drive shaft only turned approx. 1.5 turns and this was suppose to be a 3.42. so what gives?