[MetalMan]

I too liked that chassis, that extra room for batteries was nice (especially since I was using a 3s2p A123 pack on the left side, which was about 200mm long).

I forgot that the holes the center diff's output shaft were smaller. Savage diff outputs should work fine. The holes on the bulks will have to be enlarged to 14-15mm, which will be tough without the proper size drill bit.

It's great to see that you are improving on my design.
The reasoning for the gearing was due to my motor choice, which was a 7XL. Originally, the bulks accommodated 18/44, but I changed it to 20/44 to match Mike's Slipperential ratio and to better suit more motors.

Since I no longer have a Revo, it would be difficult to complete another set of these bulks since I have nothing to test-fit them to. I do still have the plans drawn up on my computer, and could easily modify them to alter the gear ratio. Then it's just a matter of printing out the plans, taping them to a piece of aluminum, and cutting/drilling them.