Pinion Depth on 8.75 741 case

805moparkid said
ok so i got it back together and took it for a spin... holy crap what a difference 3.91's make! it is so much faster!

no noise on accel (slightly more than part throttle)
no noise on decel (foot off pedal)

noise at coast and very light throttle pressure (very light like set your foot on the pedal)

i set the preload on the pinion so that it was very easy t turn but still some resistance (used bearing) maybe to soft even for used bearings?

backlash was .008 on all 4 checking points

using 85-140 gear oil with LSD additive

pattern was like "B" in the picture...

Sounds like youre in the ballpark but theoretically, there sould be no noise. The measurement to be taken when you get the pinion sinched down is to verify the turning torque. Some guys can do it by feel but thats after doing A LOT of diffs. To do it right, you need an inch pound torque wrench. New bearings should be between 25-40 in. lbs, used bearings are usually 20 in. lbs. If you rotate it back and forth the yoke should have a good amount of resistance. Pinion nut torque is like 220 ft lbs.