Can fluid leak out thru the treads on the pinion nut or even somehow thru the splines of the yoke? 8 inch in a 67.
I did some research and found out when you rebuild your diff. you should use RTV on the splines and threads just for some insurance. So yes i guess it can.I have found junk in the hole the pinion nut sits in and when I assemble a rear I make sure to use some ultra black RTV on the pinion threads/pinion nut to avoid this problem. Thinking about how the rear goes together it is entirely possible to have oil get up through the splines and out into the pocket if sealer is not used.
Carlton,I guess I am just hard headed, but if oil leaks out the splines, then something is worn to let this happen. If using RTV cures your problem, then by all means use it, I have never had to, and I have been through a lot of builds. When you remove the pinion nut most builders use a new one, and they come with a thread locker already on them.