Shakes or Wobbles problem
1988 Chevy Blazer 4 cyl Four Wheel Drive Automatic
my blazer runs and drives great in 2wd but when I put it into 4wd even 4 hi it starts to throw me all over the road. I cant even make it to 10mph. Pulling from left to right. I thought that it might be the bearings in the cv axle so I just replaced the whole unit, it came with sealed boots, and all whole chabang. After I put it back together, it is still doing it.
If the front diff is causing it to pull left then right, you may have an issue with the differential being broken and grabbing one wheel then the other. Try lifting and supporting the front end in 2wd. The spin one front tire to see what the other one does. Then have someone hold one wheel while you spin the other (may take a little force) and see if it feells/sounds smooth in the front diff. Do this on both sides