I'm trying to help my brother diagnose (via txt) a humming/whining noise his truck is making. We cannot agree on what the most likely culprit is, so I'm looking for some 2nd opinions.
Pertinent Info:
1) 2004 1 ton Dodge dually megacab longbed turbo Diesel with 321K miles on the clock.
2) automatic transmission was rebuilt within the last year or two.
3) carrier bearing and rear shaft's u-joints replaced shortly after trans rebuild.
4) rear diff gear oil changed for the first time a couple days before this behavior began.
5) when speed is over 45 mph or so and the trans is in gear, there is a steady hum/whine from under vehicle.
6) letting off the gas does not deter the sound, but shifting into neutral does cause it to go away...until it's put back into drive again, then it resumes.
He believes it is the carrier bearing, and I believe it is the rear-end. What do y'all think?
Pertinent Info:
1) 2004 1 ton Dodge dually megacab longbed turbo Diesel with 321K miles on the clock.
2) automatic transmission was rebuilt within the last year or two.
3) carrier bearing and rear shaft's u-joints replaced shortly after trans rebuild.
4) rear diff gear oil changed for the first time a couple days before this behavior began.
5) when speed is over 45 mph or so and the trans is in gear, there is a steady hum/whine from under vehicle.
6) letting off the gas does not deter the sound, but shifting into neutral does cause it to go away...until it's put back into drive again, then it resumes.
He believes it is the carrier bearing, and I believe it is the rear-end. What do y'all think?