Howdy again group.
91 Chevy Silverado, 5.7 liter, 700R4...Got snow here in Indiana finally and when I put the thing in 4Hi, it wants to hop as if I were turning on dry pavement while I am going straight down snow/ice covered roads. Never had this problem before. I do periodically engage 4wd during the summer for light off roading and sometimes just to lube everything up. It does turn all the lights on to show 4wd is engaged. What happens is it wants to pull to the right or left at different times, bad. I can't go safely over say 35 MPH.
Any ideas? TIA.