Reversed rotation vs. reversed gearbox?

[Razer]

I just got a used CR2, with a reversed gearbox. I have to rebuild it now though, and a few of the threads in the gearbox housing has gone, so since I run Xcelorin I'm thinking about just putting in a regular box and reverse the motor.

I assume that would make the car more responsive over jumps, but how would it affect handling on track on and off power? I'm only going to run this car on astro and carpet, my regular CR will do for the potatofields we call dirt tracks here in Norway