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Sorry my bad typo. I did clip inserts for all 6 solenoids with sonnax: https://www.sonnax.com/parts/5576-solenoid-stabilization-clip-insert The symptom of my transmission was like it was fine when transmission is cold especially in winter, but when it got to operation temperature, it started...

I did first fluid change because it started showing signs of clunky upshift or downshift between 3-5, I tried clear adaptive table with Forscan, but it didn't help and got worse. I did second fluid change and also rebuilt valve body with clip insert for the 6 solenoid, and it works perfectly...

I have done three times of Transmission fluid change. First time at around 30K, I did drain and refill only and verify fluid level while keep engine running and trans reached operation temperature. Second time at around 60K, I did drop the pan and replace the filter as well, while filter was...

My 2021 3.5EB Lariat is having SYNC4 version 23159 Revision915. However, my tailgate is not working as it was before, the remote control used to click button twice and it open, now, it only works sometime. Most of the time if the truck was parked and locked after some minutes, double click...

I ordered and picked up an electronic IWE for my 2021 F150 as a backup part. To my curiosity, I disassemble the part, and it is easy to disassemble and re-assemble it back. To my understanding, it has a motor to rotate the whole plastic rack up and down for the metal hub with teeth to move up...

I ordered an electronic IWE for my 2021 F150 as a backup part. To my curiosity, I disassemble the part, and it is easy to disassemble and re-assemble it back. To my understanding, it has a motor to rotate the whole plastic rack up and down for the metal hub with teeth to move up and down to...

Oh my bad, I meant light pressure steadily on brake to stop always got clunky. Hard brake to stop most of times were smooth. If I was on uphill with light throttle, I could get a huge clunky when it down shift from 4 to 3 to get more power almost every time, like it hesitate to downshift and...

Depends on how I brake. If I pressure on brake firmly, it always got clunky, sometimes it was big bump like got hit, and also I could feel the TC unblocking at gear 3. If I did like brake and let go and brake and let go, it could be smoother without clunky, but that was very annoying and not...

I believe they did, cause the noise like OP's truck was gone quiet until the bolt sheared and comes back. I doubt they tightened that bolt, and it caused it sheared after half year.

Had exactly same noise when cruising at 30-50 lower speed. Bolt was fine, took to dealer, and they fixed it by "Tighten rear end". They didn't want to tell what was tighten. Now after 6 months almost 10K kilometers, the bolt is sheard, and lighter noise comes back. Waiting for dealer to do the...

2021 3.5EB with 65K kilometers. It had clunky transmission after 20K, and then I rebuilt its valve body and it was and is still smooth now. There are many cases with these 2021 10R80 transmission with failure CDF drum. I wonder how many 2020-2022 F150s with 10R80 out there will never have CDF...

I believe when you loose valve body bolts, and loose valve body while still attaching to transmission case, it open the sealed pressure channel from valve body to transmission, that it allows draining fluid inside of transmission clutches and torque converter. One downside I can think of is, if...

Yes, that is exactly what happened. It was like driving up hill, and suddenly ease throttle (still on light throttle), then it get bump gear 3, or I feel like I did ease the throttle when the transmission just right at the moment to down shit, that cause the clunk too. If I slowly ease...

Not difficult to remove, but difficult to install cause it is quite heavy, and easy to mess up with the seals on the back of valve body. My write up about the fix: https://www.f150gen14.com/forum/threads/fixed-my-clunky-down-shifting.26184/

I did put in the Sonnax solenoid stabilization clip insert, and replaced the end cap with Sonnax end cap with o-ring for pressure valve. It is night and day difference after that. (Still having the weird noise when gear changing, but not a big deal).

So far so good, it has been almost 5K kilometers in 4 months, although as I remember I did experience two big clunks when going big uphill when I need to easy throttle, (I would think this is more relating to timing control of software), other than that, everything is smooth like new. In daily...

I had this exactly same issue before. When slow speed on a very slight uphill road, it went form 3 to 4 first, then after some distance, it gear down from 4 to 3 again, that is big clunk happens. And it almost can reproduce every time. After lots of researching, there is some theory that make...

I also found a trick to replace all transmission oil in one time. That is when dropping pan and replace filter, you can loose the 8 bolts that are holding the valve body, and let valve body loose some space, then transmission oil within transmission and torque converter will also start to drain...

I did some update to my 2021 Lariat 3.5EB transmission at the weekend ( it is 55K kilometers now), and it seems make it much smoother when changing gears, almost like new. My F150 used to be silky smooth when it was new purchased, after about 20K kilometers, it started showing clunky when...

So the electric brake booster is making noticeable noise, is it normal?