Thanks for the advice, I'll give it a go later.
I checked the hubs and found one was tighter than the other, sorted that out and now with wheels in the air both spin at the same rate, which is one thing sorted.
at the moment it moves, but doesn't take off, visibly not using all it's available power, so something slipping somewhere - will try your method for re-building the diff and checking the gear box.
how much grease (if any) should be in the diff?
and if so, where should, and shouldn't it be?
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