By doing what you suggest, you will altering the final gear ratio between the front and rear differential, in a real world situation if you were in 4 wheel drive and on a hard packed/tarmac type ground you could possibly damage mechanicals or actually lock things up and the atv wouldn't move. On soft ground not so noticable as there would be some slippage between the front and rear wheels. I have a friend that bought a new chevy pickup 4X4 and it actually came from the factory with differnt ratios between the front and rear like it had 3.55 in the rear and 3.23 in the front, factory mistake, when he engauged 4 wheel drive on the road the thing would actually slide to a stop leaving 4 black tracks from the tires, they had to replace the front ring and pinion to make things right.I wouldn't do it if it were me.