Transmission questions regarding Rebuilt or Re-manufactured

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WayUpNorth

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Hey there.

Well, we recently picked up an immaculate 2019 Max without realizing there were issues with the 10R80 trans. Our Ex has the heavy duty tow package and has about 96k miles. We live in Minnesota. We only generally only use it for road trips when we need to pull our 5x8 cargo trailer so the 13k miles we've put on it are almost all hwy. So three major road trips since we picked it up last Summer.

Besides a very loud engine fan that defies explanation that has been present since we got the EX, the first sign of a problem came this winter when, in about 20F temps, I drove away (w/o trailer) after a cold start up, not waiting more than a minute before taking off. At about 15-20mph it slipped out of gear. Settled down after a minute or so. Has happened a time or two. Last week, doing the speed limit on the Pennsylvania turnpike, we were pulling the trailer with about 1000lbs of equipment. More than once the Ex jumped out of gear, RPMs shot way up, and it started to shift hard going up/down the mtns/hills, and also briefly disengage. A couple of times it the sound/clunk from the transmission was frightening. Also, it didn't matter what mode it was in. The trans temp went up to 257F for a couple of minutes. The wrench light came on. Then eventually went off and then came on again once more before going away. As we got more into Ohio it cooled down to about 220F and the issues dissipated. However, I was driving gingerly to avoid shifting as much as possible. Very disconcerting on the highway with my family and pulling trailer, while 2 days away drive from home. We did not have this issue on the way to PA... only on our way back home. Same load both directions.

Thankfully, we got home without any more problems. But I wonder what kind of damage may have occurred at 257F and with the couple of nasty clunks that happened.

Last fall, I asked the out of state dealership that we got this from if they could send me some of the service records that predated our ownership. They did, and it showed that the previous owner had transmission issues... jumping in/out of gear. Eventually, the dealership replaced the valve body separator plate as per TSB 23-2249. That was at about 75k.

Now that we own it, and can't afford to replace the vehicle, I'm wondering what our options are. Reading through the threads regarding the transmission problems I'm bracing for the worst... thinking it's the CF Drum. But I thought I'd check in here and ask some questions and hopefully get some advice.

If the trans is toast, I'm wondering what's the best direction to go... having the trans rebuilt or going with a re-manufactured one. Honestly, I'm not keen on going to a dealership generally because of what others have been saying regarding how Ford has handled this issue to date. Sad to say but it seems that the experience of many is that they do not have the customer's best interest in mind. I'd really like to trust whoever is working on this.

It's gonna hurt no matter what, but less is better of course. I've got a couple of local shops here that install remanufactured from different companies with 3yr/100k warranties. Jasper is one of them but the negative reviews citing failure stories... and then getting warranty repair work done scare me. I think the other company was TriStar. Not sure if they remanufacture or not. Have you heard of them?

We would be glad to hear from anyone who has experience with remanufactured or rebuilt transmissions? Which way would you go and if remanunfacted, what brand would you recommend?

On the rebuild side, there's a shop that's highly recommended with good ratings about 3 hours from home. I stopped by and the lot was jammed with vehicles and they were booked 6 weeks out. The rebuild price was at least half of the remanufactured quotes I've been getting. I talked with the owner and he was aware of the problem with this particular transmission. I'm willing to drive to get the job done by folks who have a good reputation. I only want to do this once. I've also come across a company called Certified Transmission (based out of Omaha, NE) that seems to have a good reputation and they are within reasonable driving distance.

One last thing... our trans temp when not towing is around 196F. When towing, it's been around 220F until this past week. Do those numbers sound right? What's normal operating temp range for Heavy Duty Tow Package equipped Expedition Max? And what temp should we expect when we're towing what we were? And is the very load fan related to the transmission temperature?

Sure appreciate any help, direction, advice you can offer on this situation.

Thanks!
Kent
 
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DieselMonk

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Change the thermostat to the new, updated version. That should cool the tranny better. As for hard shifts etc it’s the CDF drum. As for repair or replacing the tranny, that depends on how good your stealership is and how much you trust them.
 

spo0587

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I would probably just rebuild. It's a good as new and cheaper so longer as the newest and most up to date parts are used. Rebuild is looking to be around 5-6K and Ford remain with new parts, probably 7-9K installed.
 

Calidad

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Thermostat!!! Just went through this strange transmission temp issues. New thermostat has it running 183-190 on the highway. Pushing it hard in a 2000ft climb it peaked at 201 then cooled off that was with AC on. Prior to that 212-220 was happening more often as the thermostat failure got progressively worse. It tripped an above center 228-234 engine temp the last time I made that same climb in 40 degree weather and 15mph slower speeds. Vs today 80-85mph in 80 degree weather peak temp was 201 and it cooled to 189 on a short downhill followed by a 90 minute climb to 7400ft never getting over 190.


Get the new updated thermostat!!!!
 

Hellwig

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Thermostat!!! Just went through this strange transmission temp issues. New thermostat has it running 183-190 on the highway. Pushing it hard in a 2000ft climb it peaked at 201 then cooled off that was with AC on. Prior to that 212-220 was happening more often as the thermostat failure got progressively worse. It tripped an above center 228-234 engine temp the last time I made that same climb in 40 degree weather and 15mph slower speeds. Vs today 80-85mph in 80 degree weather peak temp was 201 and it cooled to 189 on a short downhill followed by a 90 minute climb to 7400ft never getting over 190.


Get the new updated thermostat!!!!

Would you provide the model number?
 

Calidad

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Left one is the old problematic one. Right one is the updated design

Package of the updated one I just had installed after fighting with my dealer to get it under warranty.

Right away 10-15 degrees cooler on transmission temps.
Just drove to the cabin not only cooler temps but under load hard climb more stable temp, cooler by 20 degrees zero engine temp spike like prior trips.

Towing next week very curious to see what the temp behavior will be.

Pushing hard 80mph 80 degree weather up a long 4% grade 200 was the most I saw on transmission and it cooled to
190 in the up and down hills after that. Prior trip I got a engine temp spike 234 at 70mph in 40 degree weather and saw 230 on the transmission it never cooled lower than 212 the whole drive
Vs yesterday same trip new tstat never went over 200 and stayed between 185 and 190 nearly the whole trip zero engine temp spikes.
 

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East-TN

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Trying not to hi-jack the thread, you can also use the RT-1258 thermostat. It's another hi-performance thermostat that's set to 180 degrees to keep things a little cooler. I've been using it in mine and it's made a big difference in transmission temps in normal driving and towing. As @Calidad said, the old pre-'22 thermostats stick and cause temperature spikes that cook your motor and transmission.
 
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pnwjetsled

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Trying not to hi-jack the thread, you can also use the RT-1258 thermostat. It's another hi-performance thermostat that's set to 180 degrees to keep things a little cooler. I've been using it in mine and it's made a big difference in transmission temps in normal driving and towing. As @Calidad said, the old pre-'22 thermostats stick and cause temperature spikes that cook your motor and transmission.
That’s what I put in my 19’. Normal driving trans temp would hang around 205-210 and cooling fans run all the time. I haven’t seen over 190* now and fans haven’t run since.
 

ms136

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Another option is a "new" transmission from Ford, I had one installed Jan '25 at 70,000 miles. No way did I trust my dealership to install the new CDF Drum for $7200, especially when I could have a new tranny installed for $8900. According to the date on the side of the transmission, it had been manufactured three weeks earlier, so I'm hopeful that it also has the anodized reaction shell. In any case it comes with a 3yr unlimited mileage warranty valid at any Ford dealer, same as a Ford Remanufactured. Also, definitely do the thermostat, that was the first order of business after the new transmission, it's an easy peasy <30min job.
 
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WayUpNorth

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Update: We had the transmission rebuilt and replaced the Thermostat with the new one this Fall. After the relearn process it seemed like all was well but we hadn't had to tow till late November. We pulled the trailer (5x8 Aluninum enclosed loaded with no more than #1500) from northern MN to the panhandle of Florida, then to Bristol, Tennessee. It started to shift a little rougher in the highest gears as we got into the mountains in eastern TN. Noticeable, but not near as bad as before and no slipping or hunting for gears. The transmission temp was up around 230F at that point. I generally drive conservatively, basically doing the speed limit. I backed off a bit and the temp went down to about 210F. At least it wasn't the 257F we had seen before the rebuild and thermostat change. So, it seems like the new thermostat may have brought the temp down by about 20 degrees or so. Still, should I expect better shifting and temperatures with our rig with the HD tow package? Our setup is nowhere near what the advertised towing capacity is. Is this what I should expect or should I be looking for other potential issues... or...???
 

ms136

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FWIW I've seen transmission temps as high as 218F towing our 9,000lb travel trailer on flat terrain @ 85F. I typically limit my speed to 60mph and lock out gears higher than 7th. Without a headwind this setup keeps the engine mostly out of boost and at 2200 rpms promotes coolant flow which helps keep temps down.
 

mx10166

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I had to install a new transmission on my 2020 expedition at 65K miles for well documented reasons. It operated in the 200-210 degree range similar to the original transmission. But last week I had the dealer install the new RT-1252 replacement thermostat as has been discussed and recommended in these forums. I did a test where I drove the exact same 40 mile route. With the old thermostat it ran at 201 degrees and with the new thermostat it ran at 181 degrees.....so a full 20 degrees cooler!
 

Gary Waugh

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Left one is the old problematic one. Right one is the updated design

Package of the updated one I just had installed after fighting with my dealer to get it under warranty.

Right away 10-15 degrees cooler on transmission temps.
Just drove to the cabin not only cooler temps but under load hard climb more stable temp, cooler by 20 degrees zero engine temp spike like prior trips.

Towing next week very curious to see what the temp behavior will be.

Pushing hard 80mph 80 degree weather up a long 4% grade 200 was the most I saw on transmission and it cooled to
190 in the up and down hills after that. Prior trip I got a engine temp spike 234 at 70mph in 40 degree weather and saw 230 on the transmission it never cooled lower than 212 the whole drive
Vs yesterday same trip new tstat never went over 200 and stayed between 185 and 190 nearly the whole trip zero engine temp spikes.
What years of expedition does this thermostat fit. I have an 08 (250k+ miles) that I use to pull my toy hauler, have no idea how to check transmission temperatures, but would be interested in fitting the newer thermostat (for peace of mind) if it’s compatible? My engine is the 3 valve NA 5.4l V8.

Thanks for any information.
 
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