A while back I got some new tires. I tried them out in some mud and sand and ever since my VX is going in and out of all wheel drive. Slow acceleration on dry pavement makes the front wheel light go up and down radically. I can even feel a surge in pulling power up and down. Now after months of that the TOD check light started flashing then would go off after stopping and restarting. Today it won't go off and appears to only be in rear wheel drive. Can you guys help me out with this one. There is only a small difference in tire diameter so I don't think that would be the problem. Help me out if you guys can so I can fix this before winter.

thanks
Jeff