I have a 1999 dodge 3500 with nv4500 I have a rattle under truck it gets really loud at high speed cant track it down im thinking maybe transfer case or read end does anyone know what problems the dana 80 or NP241DHD would have I jacked up rear end so I could put it in gear without using 4 wheel drive I can hear it so im guessing its not in the front end need info thank you

 

its definitely rear end if I grab ring rotate it forward and back it clunks and move a bit will get a dial gage with mag base from work and check backlash [i'm not 100% sure on the correct wording new to me never done a diff] also Differential Pinion Mate Shaft i can see play in pin where the pin runs threw the gear this is all new to me have never done a diff ever haven't even been around anyone that has done one need a bit help here so I,m thinking a full rebuild is in order I have a one wheel wonder only looks like a single wheel turns with rear tires jacked up with truck not running spin a tire other goes in opposite direction

 

I think you may be onto something , but i dont think it would be the diff while going down the road... it would wine if it were a diff....

Probably should go around and check your shock bushings, all the major piviot points, etc..


The diff should only have a little bit of slack .. hell mine has like .012" of lash ... WAY to much !!! but its shot and I'm gonna run t till it brakes.. or blows up all together.. ( or if I hit the lottery or Mega Millions ) ...

Keep posted .. interested in what you find