Hello, I am hoping someone can help me with this issue it driving at 40-45 highest gear when accelerating slowly lower rmp to go faster it starts grind if I turn off overdrive and rmps go higher i can accelerate with no grinding. However, the sound can happen with overdrive off as well doesn't matter 2x4 or 4x4 however the sound like middle passenger side but if you put it 4x4 I feel it under my feet the sound goes away after 20 mins driving and things warm up. I have a 2001 150,000 mile dodge ram 1500 4x4 5.9L and I have replace all the following in the last 10,000 miles AAMCO replaced Transmission said (new torque converter), put in a rebuild transfer case from rockauto, had a shop rebuild the rear end completely replace new axels shafts, bearings, and replaced the diff with a Eaton tru trac. , replaced the universal joints rear drive shaft. I have a question so drive-train has been completely replaced 2x4 I have not changed from the transfer case forward so could a grind come front the front diff. or could my torque converter went bad? thank you

 

Might be wheels bearings with that mileage.... Go for a drive on a relatively smooth, paved road, with little traffic.... the swerve side to side rather hard.... see if you hear the noise. If you do, if you hear it when you turn right, it's the left side, if you hear it when you turn left, it's the right side.

 

It doesn't change going left or right only going straight and if I let off the gas the grinding goes away only happens with light acceleration at 40-45 if it was from the wheel bearings it would most likely make noise no matter the speed and it sounds in the middle of the truck not from the front.

 

Check your driveshaft to see if it has a center bearing. If it does, the center bearing may be possibly worn out and starting to squeal. Also, check the fuel tank. Mine has a metal shield surrounding it. The rear portion worked loose and started rubbing up against the driveshaft causing a some-timey noise.

 

no center bearings on the drive shaft it is transfer case+ universal joint+ shaft+ universal joint then to the rear end. There are not loose parts underneath

 

Since AAMCO rebuilt your transmission, I'd be tempted to take it back to them to put the truck up on a lift and see if they can reproduce the issue with the truck in the air on the lift.

 

I gave them my truck to look at for 3 days and told me there was nothing wrong. unfortunately

 

What about the other shop that did the work on the rear end? Could they possibly help with the diagnosis? At this point, I'm thinking it would be helpful to isolate the issue to the offending part (transfer case, rear end, transmission, etc.).. Some shops may have a listening tool that could help to identify the noisy offending part.