if you hold the spur gear and rotate any wheel it should rotate easily and the adjacent wheel should go round in the opposite direction.
If the wheel doesn't turn easily /feels notchy then the diffs are too tight.
You also need to check that the slipper slips before the diff.
First hold both rear wheels so they can't rotate. Now - rotate the spur gear. - The spur gear should rotate (it will be quite stiff)and the slipper shaft should not move. - Otherwise the diff is slipping.
You can check the front diff like this as well but it's not as critical as the front diff sees much less load.
(Some people hold the spur and rotate 1 wheel to check the diff. -Don't do this- This doubles the torque applied to the diff, and will make it slip before the slipper. - The diff will never see this load on track. - Rotate the spur instead as described above.)
Other things to bear in mind - you need to run in a freshly rebuilt diff before you try to adjust it or it will get looser and slip . (Hold one wheel and apply partial throttle for 30 seconds). You will also find that after the first 5 minute run it will usually loosen off slightly and need adjusting again. This is normal as the components bed in.
If the diff keeps getting looser after 3-4 runs then there is a problem.
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