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If the bearings were “too small” they would be overheated. Mechanics are not engineers.Had the same noise start at 80k miles. Took it to a local differential shop. A little over $1,000, new pinion bearing and noise gone. The mechanic said this is common on all F-150s and the bearings are too small for the application. He also said it would probably go along time before failure, but the noise would progressively get louder. He showed me the bearings and they looked fine the outer race had slight wear. I had changed the differential fluid at 80k miles for the first time when the noise started. The old fluid looked clean, no obvious contamination.
Soooooooo... pulled skids the next day. All hyper torqued with three cross threaded. Had to break out the dies. One front nut clip broken2020 Gen 2 with 67k miles and change, no lift, speed dependent whining noise from rear. Sad to say little off road, pulled a 4000lb boat a few times.
Pulled diff fluid. Nothing notable in appearance, nor smell (non-burnt fluid). No water, nor unusual metal on plug, but some "specks" in pumpkin. Fluid clean bottled and sent with truck to what I hope not to be a $tealership.
Diagnosis: Pinion bearing failure and right wheel bearing. Rear end being rebuilt. Covered under ESP. $stealership seems ok thus far.
Get it home. Had trans filter changed while it was there. Trans fluid not cleaned from cross member and drips in garage. Tech used rtv sealant instead of gasket on diff cover and he also forgot to plug Elocker back in.
Feel compelled to pull all skids tomorrow and check everything. Hope I don't find cross threaded bolts or over "torqued" lugs... not holding my breath but will see.
Dang brother that sucks, sorry you’re having to go through that! It amazes me the huge delta between sometimes having a really good service advisor and tech, and then seemingly pulling up to a kindergarten service bay!Soooooooo... pulled skids the next day. All hyper torqued with three cross threaded. Had to break out the dies. One front nut clip broken
Transmission pan although seems fine, wet with oil. Have seen no more thus far after a rag and brake cleaner. But now I have rattle to buzz under acceleration coming from transmission area. 1-3 shift slams hard briskly puling from a stop, and occasional 4-5.
While cleaning up RTV on pumkin, realize the hard brake lines/bracket was never bolted back down on top. Just bouncing around with captured bolt stabbing the top. You know, right next to where I'd already found Elocker not plugged back in.
To add insult to multiple injuries... 20B39 (camera recall) was performed WITHOUT MY KNOWLEDGE OR APPROVAL/NOTIFICATION on my WORKING and properly FUNCTIONING camera system. I don't use 360 camera on way home only to find the front camera does not work in 360 mode pulling into my garage... 45min-1 hour one way from $tealership. The separate forward viewed works, but the front portion of the surround view is blacked out.
I plug in forscan and so many codes come up I launch laptop across garage...
That was May 17th... Due to me teaching 11-12hr a day back to back ALERRT Active Shooter classes, truck has still not been picked up by $tealership/Service Manager between our "schedules".