savage tranny upgrades?
Check this out, I have copied this from the HPI site regarding tranny upgrades:
Available soon from HPI Racing is our new Aluminum Drive Gear 18-23T for the Savage monster truck! With its lighter rotating weight, this gear allows the Savage to accelerate faster, and also enables to drivetrain to run with less resistance than the stock drive gear.
Might be worth checking out, but in my opinion the stock tranny is built solid