Ah, I was after that works gearbox but forgot about the auction ending!
The gearbox sits further back in the Works car, so the diff is more in line with the rear wheels which sit further back with the Works arms.
See the pic from my
build thread on RC10talk below, that shows the rear driveshafts angled back to the wheels. Apparently this creates 'dynamic squat' pushing the rear down, which is undesirable - hence the works gearbox moves the diff back.
Oh, and you'll need to re-drill at least two holes in the chassis or wait for a unicorn to sell an original Works chassis.
