I have a Rs4 3 and was wondering if anyone had found a way to make it rear wheel drive, but be able to switch back to 4 wheel mode. Whould that make its top speed increase?

Take out the front dog bones, and center front dog bone. Voila - 2 wheel drive.

You need to think about the fact that you will also only be able to brake using the rear wheels, so you'll be easily thrown into a spin when you hit the brakes.

I see no reason to think that going to 2 wheel drive will increase your top speed. The only advantage would be a slight reduction in drivetrain losses, which I can't imagine will result in any difference in top speed.

If you want to increase your top speed, change your gearing.

I wouldn't bother, if you want more top speed, get a good pipe. If you want more than that, gear it up. If you want better acceleration, get a new engine.

the little hex screw fell off my frontend of the spur gear so it's been 2WD ever since, well until i buy another screw, but trust me, since it's been 2WD i've never played with it, spinning out and TRYING to go straight will be all you're doing, i mean, it will go straight, but have fun turning unless you're so slow you're almost stopping. and no it doesn't increase speed

alright thanks