Originally Posted by Djr8505

So last night I cracked open the tranny to clean and re-lube the gear diff in my truck. When I bought the truck second hand I had assumed that the previous owner used the planetary gear diff and bought 60K diff oil to put in it. Well turns out it is running the older sun/spider gear diff configuration from the 22sct RTR. The diff was nearly dry inside (no surprise) so I added the fluid and the diff does work but is definitely very stiff. It is almost like the Posi-lock in my truck. For anyone who is using the older diff style what weight fluid are you using for indoor carpet or turf?

I guess one benefit of the heavier fluid is that it should be significantly harder for it to leak out everywhere!