I have a 98 gmc 3500 pickup with a 6.5 diesel automatic. Recently while
plowing in 4 whl high I put it in reverse and a BANG (like when it
slips out of gear) happened. Since then, when in 4whl high drive is
fine but reverse only results in 2whl action. 4 whl low is working
normally. Is this in the transfer case? Snow is in my forcast! Thanks.