Hi again.
Checked both diffs and both were worn out.
I did notice that it was the big cog on both diffs that is on the plastic side of barrel that had worn out teeth and not the other side.
Im wondering if this is because there is movement in the plastic casing.
Has anyone else expirienced this when changing diff cogs.
Fitted the reverse module and wasnt as hard as the drawings looked.
Still have to test truck tonight because was a bit late to start it last night but wheels dont slip on diffs now so should run ok.