When I make a right turn at slow speed, I can hear a thump, thump, thump coming from the drivers side wheel area. Doesn’t do it in a left turn. Any clues on where to start looking? My passenger side brake caliper broke the through bolt once but it was more like a rattle. Wheel bearings were checked not long ago and all was well.

 

I'd say look at the tires , the wheel bearings and the rear diff, espcially if it has a limited slip in it.
Get it rolling and start the turn, turn the Cummins off and have someone ouside watching it. You will find something!!

 

If it's a 4x4 I'd suspect the front axle u-joints..

 

Thanks, but it's not a 4x4. However the thump does sound like a front u-joint going out.

 

Replaced all the u-joints they were about gone and the carrier bearing was rough so put in a new one. Still can hear a slight rumble that shouldn’t be there. Next check is the rear differential. If it’s bad how much to replace that dude?