Horatio
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Please post photos of your 13t input gear and 43t Diff bevel gear.Update time!
I have just changed the shims in the rear diff over to the Kyosho ones mentioned above, 2x0.15mm instead of of the 2x0.1mm ones from the factory. I did also notice that I had obviously put waaaay to much grease in there the last time I tried to fix this issue.
I cleaned off all the grease and put the diff in dry just to rule out any slippage being caused by the grease.
The damn thing is still slipping. I hold the front tyres up and lightly step on the rear of the rig so those back tyres are going nowhere and I can still see the rear axle hub slip occasionally along with that god awful noise of metal on metal that is not supposed to be there.
I am running out of things to try here other than just chucking a whole bunch of money at it replacing it everything: diff housing, diff spur, new drive pinion (again.... both are relatively new and don't really look worn), possibly even the rear->center drive shaft. First up I'm gonna see if I can dump a third shim in it perhaps.
If they're pointy or missing teeth entirely - they're no good.
These should not be slipping as described, regardless of how you use shims/no shims.
Shimming correctly ensures the right backlash ie - virtually none - and ensures smooth running. If the gears are already destroyed having been subjected to slipping, no amount of shimming will help.
From what you've described - slipping with no load - it sounds like the actual diff housings are cracked or broken.
Get some decent light on the subject, take photos, and let me see, please.