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weird vibration/grinding noise at 1500 rpm
Ok guys its been a reaaallllllyyyyy long time. Just haven't had any trouble and life gets in the way of the things. Any way three weeks ago I started having a vibration/grinding noise just before 1500 and you can feel it in the floor, pedals and steering wheel. Does it in park neutral and drive. Most noticeably in first gear leaving a stop and overdrive just as it shifts into overdrive. It feels like your driving on gravel is the best I can describe it. Things I've checked- motor and trans mounts, ok - things rubbing frame, no harmonic balancer, looks ok, not leaking -oil, correct level- trans fluid, a little high- new fuel and air filter, no codes. I did add hot shot secret four or five weeks ago. The truck honestly is running better than it has in several years. My fuel mileage is way up from 8mpg and it shifts into fourth and stays until it needs to shift. Normally its more like 1........2..........3...4...od. Not an issue right now. Just the vibration. Any ideas?
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2000 f-250 4x4 ex cab 7.3 psd. diablo programmer, TS 6 pos.
, 4" exhaust turbo back w/ 5" stacks, wicked wheel, HX cross over, zoodad mod, 6637 mod, boost pyro & trany on the a pilliar. 315/75/16 bfg mt's,.superwinch hub's, 6.0 trans cooler, banks trans command. sky jacker leveling kit