3905 differential question and aftermarket help...

[suicideneil]

The hotbodies buggy diffs are great ( I have them in my UE ultralite cases ), if a little pricey- Mike sells a kit in the rcm store that includes the pinion and bearings required too. Otherwise, anything ofna makes for 1/8 buggies is fine and cheaper too most likely- 43/13 being standard buggy diffs ideal for the maxx in 2nd gear. If you went with a center diff however, the 43/10 truggy diffs might be a better choice- you can always play with BrianG's calc and see what works best for you.