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Thee Kaptain

RC Newbie
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  1. Bashing
My 4x4 truggy is only engaging the front drive and not the rear. I took the rear diff apart and it looks fine. What next?
 
Center diff could be cooked, wheel hex could be bad. Diff cup grub screw could be lost and the cup is spinning on the shaft, wheel axle/hex pin sheared off...

You have to figure out what moves and what doesn't. Does the rear center axle spin when the truck is running? Do either of the left/right rear axles spin when the truck is running?

When you figure out what isn't spinning, then you know where you need to look.
 
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