Check the pins that hold the idler gears haven't either moved into the wrong hole (not sure if you can build it like that, but worth checking) or damaged the casing, allowing the idler to come out of engagement with the diff.
How much of the gearbox moves when you attack it from either end?
If you turn the out drives, does the lay shaft turn? Or the spur gear?
If you turn the wheels, does the spur move?
If you turn the spur do the wheels turn?
Just trying to work out where it's not working.
Could also try some AE slipper pads, they are the same size, but slightly thicker than then stock ones.
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