Hey I posted an update. Basically the OEM Goodyear Eagle F1 A/S tires were the culprit all along! I replaced them with 275/35-20 Michelin Pilot Sport AS 3+ and it resolved the vibration issue 100%. Happy as a clam now to have the car running smooth!
Glad its running well now! Mine turned out to be part of my exhaust making contact with my rear swaybar. Feels much better now.
Lol, what? You didn't want to read 3,700 other posts
? J/k. I had an issue with it. Link to one of my posts re that issue with a copy of the invoice, and below it are some pdfs. Vibration between 50 & 70 mph | Page 235 | 2015+ S550 Mustang Forum (GT, EcoBoost, GT350, GT500, Bullitt, Mach 1) - Mustang6G.com
When New my 2011 mustang GT six speed manual had this migration the dealer ended up swapping out the entire rear end from where the cars they had in stock with the same gear ratio and it solves the problem
They said with so many different things they would check the balance of the tires and beyond that it was a whole axle replacement. Rebalancing did nothing so they swapped the axle in and it was completely gone. I remember back in 1996 with my cobra Mustang I had swap the gears from I believe at 3:40 to a 4 10 and I had driveline vibrations that nobody could solve. Wasn’t horrible but it was enough to be slightly annoying never did solve the problem but perhaps there was some resident frequency set up by those gears
My ‘19 drove smooth as silk - Ecoboost w/AT. BUT I now have a ’17 Ecoboost w/AT and it HAS the vibration.
I only had vibration after replacing the driveshaft. I put three different shafts in the car and they all vibrated. I had three different sets of wheels and none of them made any difference. Could be something with pinion angles in the older s550s. My s550 is long gone and I’m building a vette now.
Lol - I traded a very nice ‘98 Vette for my current Mustang - currently I like this car very much but I’ve owned 5 Corvettes and about as many Mustangs - since 90% of my driving is less than 45 mph in town the vibration is not a major issue so I’ll just live with it until that next car pops up lol.
I just got to stay away from our used car lots because I just know if I see a really cool Vette that’s on my “Bucket List” I’ll trade this thing. Lol
So far I’ve figured out quite a few things in general fords either truck/suv/mustangs (most cured with forscan) battery replaced needs a BMS reset done with ignition on/engine off pull high beam lever 5 times and press brake 3 times within a 6-10 second time and battery light will pulse a few times indicating its been reset, other stuff like pcm reset all adaptations will have it running like it did off the dealership when bought within a 1 minute idle on first start etc relearns everything. Another if modded is an ABS speed sensor recalibration, and Forscan doesn’t have the option for the Miss fire monitor neutral profile reset but any shop with a diagnostic tool will be able to reset it and this needs to be done with any powertrain sensor or part from engine to dif either replaced/moved as it relearns new positions in all hardware etc and will remove any ghost issues behind all this which make is think is hardware related but of course there will always be that 10% of cars with actual hardware issues. Hope this helps! I even enabled performance shifting (normally whats enabled in police cars
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Interesting .,.. first time I've heard of this procedure to reset the BMS.