Loss of acceleration. Mine is a2021 poweboost and it happens mostly in turns

[Lefty665]

I can't imagine that ford will have dealer service departments cutting open torque converters and replacing the stator, then welding them back up again, and balancing them afterwards. Replacing the stator in an electric motor? Possible I guess.

Place I worked for worked with GM/Delco on the early locking torque clutch converters (TCC). GM shipped us failed TCCs that had been replaced, we cut them open and GM engineers noted the failure modes. We then repaired them, welded them back together and GM sent them out as remanufactured warranty replacement parts.

GM incorporated fixes in their TCC production line. After about 3 years the flow of defective TCCs slowed to a trickle, GM quit analyzing failures and we were out of the TCC business.

The good news was watching GM figure out failure modes and incorporating fixes in production. The bad news was that end users were once again the QA, as is too often the case.

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[v8440]

But that place was not a dealership service dept, was it?

 

[LuckyTrucky]

Funny this popped back up today. I just checked for leaks again and sure enough transmission is still leaking.

 

[Lefty665]

v8440 But that place was not a dealership service dept, was it?

No, we were a company contracted by Delco (Delco mfd the TCCs for all of GM) to analyze TCC failures that had been replaced by dealers.

Dealers diagnosed the failed TCC and replaced it, exactly what we would like the dealer to do. We and Delco took the failed TCCs apart to see precisely what had failed and to figure out why. Delco then incorporated fixes in their production line to prevent failures going forward.

On the 10r80 it is great that some dealers have knowledgeable techs who can disassemble, diagnose and repair the trannys. The 10r80 is a complicated critter. It is not a surprise that techs competent to work on them do not exist at every dealership.

Ford is not relying only on dealer service departments for reports on what goes wrong inside 10r80s. They want Ford engineers examining failed transmissions themselves after they have been replaced by dealers to verify exactly what went wrong, why, to identify fixes and to incorporate them in production.

That would especially be the case if it takes several variables, perhaps including mechanical, hydraulic and software, coinciding to cause the problem. Is the failure the dealer tech identifies cause, effect or coincidence? That's not likely a simple problem. Simple issues mostly get resolved before parts go into production.

 

[v8440]

That's kinda what I figured. Someone earlier in the thread said something that possibly could have been interpreted as dealer svc depts were fixing internal problems in torque converters, and I was saying I found that unlikely.

 

[Lefty665]

That's kinda what I figured. Someone earlier in the thread said something that possibly could have been interpreted as dealer svc depts were fixing internal problems in torque converters, and I was saying I found that unlikely.

I agree, and I expect your Chevelle would smoke my Olzmobile.

 

[v8440]

I'm not sure I follow. What Oldsmobile do you have? Nevermind, I see it now. I dunno, the chevelle is just a cruiser.

 

[nitrobass24]

Back on track here. So besides @LuckyTrucky has anyone solves this and did it end up being the same as LT?

it’s happening to me a lot lately and I want to go to the dealer armed with information so I don’t get the let’s clear the tables response.

 

[JayRay]

The CDF drum issue is most likely not specifically what causes the truck to get stuck in second. That tends to be more what causes the RPMs to bounce around a little while at highway speeds. That being said, my dealer’s tech is convinced that there is more damage that happens in the transmission that is missed and not repaired when doing the replacement to the CDF drum. After much messing around, they finally got the approval to do a complete rebuild of the transmission. This was almost 6 months after my CDF drum was replaced. Supposedly some of the little check ball’s were missing, etc. I could find the complete write up if you’d like. I haven’t had an issue since. That was about 9 months ago.

 

[Zonk22]

Mine seems to only happen in first 30 seconds of driving. Warm fluids and sensors or cold.

 

[nitrobass24]

Mine seems to only happen in first 30 seconds of driving. Warm fluids and sensors or cold.

that’s how it starts. Now I can make it do it nearly on demand.

 

[nitrobass24]

The CDF drum issue is most likely not specifically what causes the truck to get stuck in second. That tends to be more what causes the RPMs to bounce around a little while at highway speeds. That being said, my dealer’s tech is convinced that there is more damage that happens in the transmission that is missed and not repaired when doing the replacement to the CDF drum. After much messing around, they finally got the approval to do a complete rebuild of the transmission. This was almost 6 months after my CDF drum was replaced. Supposedly some of the little check ball’s were missing, etc. I could find the complete write up if you’d like. I haven’t had an issue since. That was about 9 months ago.

Gotcha so a full rebuild for you. I’m way out of warranty so I’m not interested in 5 exploratory trips to the dealer. Maybe I should just have them quote me a rebuild/replacement.

Or I supposed I could trade it in for a newer model.

 

[LuckyTrucky]

Just in case anyone was curious.

Got my truck back last Friday 11/14/25. The leak was around one of the front bolts near the transfer case. They had to pull the whole transmission out and replace the case. Waited a couple weeks for all the parts. Hopefully that does the trick.

Still shifting very smooth and no dead throttle or anything like that, so that's good.

 

[21F150_208]

I took my truck back in after the latest TSB failed to fix dead pedal. The service technician wrote a snarky statement that the transmission is working as designed and that I don't know how the transmission works on a hybrid truck.

I did not say a word and left the $!@#ing dealership. While I might have felt better tirade the service desk person in the moment, that person didn't write the words. I am going to wait until the temps drop to be able to recreate the issue on demand. It's going no where until I can reproduce it in front of them.

 

[v8440]

Wow, stupid AND an asshole, that's a bad combination in a technician.

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