I just bought this 98 12v 2500 and had the differential rebuilt. I now notice when I'm on the freeway and I'm going up hill and put some torque on it, I get this grinding sound like the rear end is bad still. But I think it's coming from the transmission. I want to use the truck for towing. What would be the best way to deal with the trans issue?

 

I wish I could help you Darnjoe. I figure someone here knows