Rearend problems....

[lukecp]

I went to go put a new rearend yolk on my truck today. The truck is a '72 C10 with a coil-spring 12 bolt. I removed the driveshaft, and counted the number of threads on the nut that holds the yolk on. There were 2 threads showing on the bolt. So, i removed the nut, took off the old yolk, and went to put the new one on. The new yolk was a little different. On the old yolk, the U-joint cap bolts simply screwed into the yolk. On the new one, the hole was threadless and i had to use nuts to hold the U-joint on. Anyway, i put the yolk on, and torqued it down until 2 threads were showing. I noticed that the wrench was pretty hard to turn. So, i finished up the job and went to drove the truck. About 75 yards down my road, going about 30mpg, a loud deep moan started to come from the rearend. Immediatly, i stopped and drove the truck back in reverse. Over 10mph in reverse, the moan came back again. It also seemed that when i was backing up a hill, it "jumped" a little bit, like the teeth on the gears were skipping. So, i am thinking that the two yolks were different thicknesses, and i overtoruqued the pinion nut when i put the new one on. What would i have destroyed by doing this? Just the pinion crush sleeve, or the whole ring and pinion? I only drove the truck 150 yards tops. What should i look for when i pull the rearend cover off tomorrow?