Pulled the zerk today, gave a good solid stream of break cleaner into the fitting. Let that sit for a few minutes then when for a test drive. Drove over a few speed bumps to get some movement in the line. Unfortunately the noise was still present. Went ahead and put the zerk back in and gave it 3 or so pumps from the mini grease gun. Didn't see any movement or ejection from the zerk when regreasing. Went for a test drive, still had the noise.Do yourselves a favour and pull the spline zerk for rear D/S. Spray some brake cleaner into the fitting and test drive. You could also have a chbby friend bounce the body while you watch the spline for movement while rocking the rear end.
If there is movement then replace the zerk and lightly regrease.
When greasing splines watch for movement or grease ejection from zerk this is not good. Movement will increase d/s length thus applying force between the T/C and diff...force equals growl!!!
An overgreased spline will act like a hydraulic ram preventing your driveshaft from floating.
Those of you who run tracked equipment will be familiar with how grease is used to tighten tracks.
Without pulling the driveshaft I think its tough to really know how much grease is in there. Still might do that if I have time before the week hits.
Tomorrow I'm planning on checking/changing the T-Case fluid and can report back on that.