Quote:
Originally Posted by bds325is
just had this w my 05 4.4 ...at 87 mph ...which is 2800 rpm...groan in floor....Problem was alternator going bad.. bearings were going bad...caught it before complete failure...Of course to find it I replaced every pulley and belt .
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Thanks BDS...I thought that the alternator bearings going would be more or of a whining or mechanincal noise.
This is very much a resonance. I think that I can 'feel' it in the wheel well and it seems to be rpm related around ~2,000-2,500 rpm at different speeds.
Thats why I was thinking drivetrain - differential or trans (
).
Any other ideas?