I took the motor off and the gears were still meshing well and looked good. The slipper clutch was adjusted well and OK too. You can spin 1 wheel and the other will not do anything. So I went to a different hobby shop 50 miles away (off the other side of the mountain) and got the pro ball diff. It cost over twice what the stock parts cost, but now I will have a much stronger rear diff. Now I just need to put the thing in. Just by looking at it in the shops parts catalog, you could tell it is a better part. I will let you know how the install goes and how it works. It might be a while because it is going to snow all week long.