RE: Savage 3.5 X RTR vs. Savage 4.6 XSS kit
The HD outdrives and dogbones are useless in the XSS kit.
the std X4.6 diffs are good enough for most trucks, even the ones making epic power.
if the X3.5 has the aluminum diffs, and the easy access gearbox and bulkheads, GET IT!