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Vibration under load?
I'm hoping someone can help me pinpoint this issue. I have a vibration ~60-80mph and it only occurs under load (acceleration/holding speed). Once I let off the throttle, it goes away completely.
It feels as though it's coming from the center of the truck - not from the front end, or rear, and not tires/wheel balance.
A couple weeks ago, after not driving it for a couple weeks, the vibration started earlier (~45-50mph) and was the worst it had been. After driving for a bit, it seemed to lessen and it's now happening only at the higher speed again (65-80) but, is a bit more noticeable than before.
Considering it only occurs under load, I'm thinking driveshaft issue....
01 7.3 f350 CC/SB - chipless w/3:73s