Hello all.

Yesterday I changed the oil seal which sits where the propshaft connects to the diff. To do this I had to remove the yoke and thus remove the center nut that secures the position of the pinion shaft. To start with it was extremely difficult to remove (took me half the day) and in the end I succeded by shoving a shop rag in the gears in the diff and using a breaker bar. Now the seal is changed and all is put back together. However, today when I drove it, I got some whining and whirring sounds from the diff, whining when accelerating and a low whirring rumble when breaking quite hard (not super hard).

Now, when putting the pinion nut back on, I couldn't get it quite as tight as it was (I know because of the locaion of the metal flange on the nut you hammer in the the slot in the shaft to stop it comming undone) and so the question is, could the noises be due to the nut not being as tight and thus not pulling the pinion bearings in to their seats hard enough? We're talking maybe one tenth of a rotation that differs between before and after. I didn't touch anything else in the diff so the backlash should not have changed.
Sorry for the lengthy text but I wanted to fully explain.

Any help appreciated.

/Albert