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Well, couldn’t tough it out any longer. Traded mine in for a 2021 XLT 2.7 with 20k miles on it. I immediately noticed during the test drive that it was smooth as butter in 8-10 gears. Have owned for 3 weeks now and still smooth. Bonus is that I went through a custom truck dealer and it came with...

Have a 21 3.5 with 16k and had the TSB update 2k miles ago. Still shudders but not as bad (90% good now which I can tolerate). Also running 89 fuel. 91 seems to make it near 100%. Seems the 91 doesn’t help everyone but worth a shot if you haven’t tried it yet. Going to be trading this in after...

Noticed too when the turbos begin to spool in 8, 9 and 10. Can replicate every time and goes away immediately when letting off. It’s been discussed before but anyone recently have any success with getting their truck bought back from Ford as a lemon? Have now put 400 miles on it after the...

Had the TSB performed last week and noticed it had smoothed out on the 10 mile trip home from the dealer. Noticed it slowly came back and now it’s shuddering again if not worse now with 100 miles so far. What’s crazy is that the tech didn’t even drive it prior to or after the update to confirm...

Have posted a few times too about the same 8, 9 and 10 issue. Have had the truck in the shop 3 times and the third time they flashed the table (Fords recommendation to the dealer) and it was good for a few hundred miles. 10 months of ownership and approaching 10k miles and same ole shudder at...

Man that’s unfortunate. As you have probably done so by now look up your states requirements to meet the lemon law. Quick update about mine…300 miles now since getting truck back after 3rd time in and I’ve noticed the issue has started to return. Mainly around 50-65 mph in 10th under light...

Update: Shop had the truck for 3 days and I picked it up today. On Monday the dealership called at the end of the day (1st day having it) and said they were puzzled and had reached out to Ford. According to the service notes, they “performed accelerated main control breakin through FDRS, retest...

Did Ford give you a reason of what criteria wasn’t met?

Got the truck back today after the second time in the shop. Tech drove it and felt the shudder. They had it for 2 days and he found that the transmission fluid was a quart low. Added fluid and listed that the problem was resolved. WRONG. Shudder is even more pronounced now. Went right back when...

Asked when I went to pick mine up back in July with 2200 miles on it. SA said they don’t do that unless there’s a TSB stating to do it. Now at 5900 and it’s going back next week because it’s gotten worse.

Found another thread for others who are having the same issue. https://www.f150forum.com/f129/shudder-jerking-issue-when-accelerating-508814/ Posted a few months ago about same issue (2021 Supercrew 3.5 EB). Approaching 5000 miles now and problem is still present…8, 9 and 10th gears have what...

Just finished up a +580 mile road trip and switched to 93 octane beforehand from empty. The shuddering almost completely disappeared shortly after the full fill-up (topped off a couple times throughout the trip). Going to run the tank down and switch back to 87 to see if it comes back. Surely...

Any updates from those of you who posted about a shudder in 8, 9, and 10 under light acceleration at highway speed? I have a 2021 XL STX 3.5 EB and it started exhibiting the same issue around 600 miles (mainly highway driving in “normal” drive mode with a lightfoot to maintain cruising speed). I...