It's not that simple on the 1/10th traxxas platform. The way traxxas makes the rear diff, the center axle's rear support is the rear diff input pinion and the rear input pinion is held in place with the rear ring gear/diff cup. So at the very least, you have to keep the rear diff intact (which is rotational mass), then you dissassemble the rear output drive to remove the slider from the yoke/axle going to the rear wheels. So you will still have the rear diff, but won't have anything connected to the output shafts.
That said, I've had the rear axle break on a few RC's and they just don't drive. You end up with front wheels that just spin constantly regardless of the surface your on. They aren't like a 1:1 car where 50%+ of the weight is over the front tires, so you get very little forward traction out of the front generally.