When I run my truck the diff nut slipps and get reaaly tight, I try to lossen the lock nut about a 1/4 turn like the instructions say , but it still gets tight. any sugestions????:\:\
Loosen up the nut and clean it up good with a grease remover on a q-tip and put a dab of medium or thick tire glue on the threads and put nut back into position....When the glue dries it will keep the nut in place.If you ever need to remove nut ;- a dab of debonder gets it free..You can also use loctite but I found that it eats up certain plastics thats why I use tire glue....Good luck
May also want to check and make sure your not missing a washer or something on yours. If not, try what he said (I use threadlock blue gel) or buy a new nut. After a few on/offs, the nylock nuts don't hold very well.