ORIGINAL: ASSOCIATED_DRIVER
I see it clearly now.
I just got 2 used Duratrax F1, first I was surprised that there is a rear diff.
They were spinning out of control because the diff is locked with some type of glue.
Do pan type cars like RC12 have rear diffs also?
What color is the glue? It could be JB weld which is an epoxy. Jb weld is gray, if thats the case then it''s time to look for new parts. If its clear glue then it''s probably hot glue which can be picked off.