I have an 89 chev k1500, 4X4, 5.7 auto. I just picked up this project. When I put it in 4wd, and drive foward a bit, the tires turn in. Mostly the right front. it puts the front end in a bind. I have to back up, and get it out of 4WD. Put it back in 2wd, and it drives great down the road. I've never dealt with this before. Do you think the front and rear has different gear ratios? How can I find out what they are?