Depends on which gearbox you're thinking of. But, why would you want to? Not that the gearboxes are bad or anything...but some of them still require gear reductions. I'd save myself the money and trouble and go with 3:1's.

To use Tamiya gearboxes, you will have to customize a mounting plate to attach to existing standoffs in the HL hull and mount the gear boxes to your custom mounting plate......or, you can purchase standoffs at the local hardware store and do with out the mounting plate....but, that may not be as structurally sound.<br type="_moz" />