Originally Posted by ryWA

When you pull the diff out i would strip it down fully, and check the out drives turn freely in the sockets check your orings, just go through and clean everything give it a good check then stick it back together and see if that helps!

On my old xray XB8 i had the front diff feel all messed up and it turned out that it was from a lack of lube on the outdrive where it goes into the diff, it could be many things that is why i say to strip it down, clean, re oil and re lube then put her back together!