23+ Reliability issues?
Mountain Pass
Joined: Sep 2024
Posts: 164
Likes: 85
From my understanding Ford has performed some upgrades to the 2026 10R140, along with changing the service requirements.
Again, from my understanding based on information out there, the new service requirements will require you to spend a bit more at the dealership/maintenance bay, but it should eliminate a lot of the issues people were saying they were facing.
Since you are keeping your truck a long time, you need to make sure that they are following the correct (revised) work order.
Drive in tow-haul in heat, at elevation, etc., even when not towing/hauling.
A lot of the issues seemed to be from mapping that would try to get the very best MPG out there, as well as components that were not quite up to the task. Between the changes over the years (including 2026), and the mapping changes, things should be improved. That said, you will need to have preventative maintenance performed if you want to keep the transmission happy.
Again, from my understanding based on information out there, the new service requirements will require you to spend a bit more at the dealership/maintenance bay, but it should eliminate a lot of the issues people were saying they were facing.
Since you are keeping your truck a long time, you need to make sure that they are following the correct (revised) work order.
Drive in tow-haul in heat, at elevation, etc., even when not towing/hauling.
A lot of the issues seemed to be from mapping that would try to get the very best MPG out there, as well as components that were not quite up to the task. Between the changes over the years (including 2026), and the mapping changes, things should be improved. That said, you will need to have preventative maintenance performed if you want to keep the transmission happy.
Cargo Master
Joined: Apr 2021
Posts: 2,016
Likes: 749
From: Texas
FFS. Get the gas truck.
The 10 speed has a few noisey complaints. And a few basket of death issues. Both should be well known by now. Being that SD's only come with one trans, if it was a major problem, thered be hell to pay. And the net would be in full insano mode, by now.
Ford should rethink offering a 6 speed manual trans, and manual xfer case. At least on the gas trucks.
The 10 speed has a few noisey complaints. And a few basket of death issues. Both should be well known by now. Being that SD's only come with one trans, if it was a major problem, thered be hell to pay. And the net would be in full insano mode, by now.
Ford should rethink offering a 6 speed manual trans, and manual xfer case. At least on the gas trucks.
the only one that had an issue is 2 months after I bought the 24. It took a ****
It was just outside a tsb thung for being assembled with wring wave bearing.. thats a whole different discussion
but ford put in a brand new one
Now with 7800miles no issues at all with the truck
Mountain Pass
Joined: Sep 2024
Posts: 164
Likes: 85
The upgrades I have heard about (not confirmed mind you, just heard of) are:
That said, the preventative maintenance changes are probably going to be what really helps out, but they are going to cost a bit more. From my understanding, transmission maintenance will be a LOT more frequent, not just a 150k mile service, but I've heard every 30-60k with a full flush and map reset along with doing a drive cycle..
- Valve Body & Pump: Re-calibrated valve bodies and pumps increase line pressure (up to 60 PSI) and improve oil flow to critical clutch packs (like the F and B clutches) for faster, cooler engagement.
- Clutch Packs: Upgraded Raybestos GPZ frictions and increased clutch counts (e.g., 5 to 6-clutch stack) handle more torque and reduce heat.
- Drums: Upgraded CDF (C, D, F) drums, often anodized or reinforced, address bushing movement and provide better support.
- Torque Converter: Billet multi-disc converters manage higher horsepower and torque.
- Cooling & Pan: Deep aluminum pans (PPE, Mag-Hytec) reduce fluid temperatures, extending fluid life and transmission durability.
- Internal Hardening: Hardened input, output, and intermediate shafts add strength for high-power builds.
That said, the preventative maintenance changes are probably going to be what really helps out, but they are going to cost a bit more. From my understanding, transmission maintenance will be a LOT more frequent, not just a 150k mile service, but I've heard every 30-60k with a full flush and map reset along with doing a drive cycle..
Last edited by Stonehauler; Jan 6, 2026 at 01:23 PM.
Hotshot
Joined: Apr 2013
Posts: 10,118
Likes: 650
From: NH
I don’t believe virtually any of those upgrades actually occurred. Ford made a change to the drum material to increase hardness, that occurred maybe in 2024? I don’t think anything else was actually confirmed.
Thread Starter
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Cross-Country
Joined: Jul 2003
Posts: 97
Likes: 34
The upgrades I have heard about (not confirmed mind you, just heard of) are:
That said, the preventative maintenance changes are probably going to be what really helps out, but they are going to cost a bit more. From my understanding, transmission maintenance will be a LOT more frequent, not just a 150k mile service, but I've heard every 30-60k with a full flush and map reset along with doing a drive cycle..
- Valve Body & Pump: Re-calibrated valve bodies and pumps increase line pressure (up to 60 PSI) and improve oil flow to critical clutch packs (like the F and B clutches) for faster, cooler engagement.
- Clutch Packs: Upgraded Raybestos GPZ frictions and increased clutch counts (e.g., 5 to 6-clutch stack) handle more torque and reduce heat.
- Drums: Upgraded CDF (C, D, F) drums, often anodized or reinforced, address bushing movement and provide better support.
- Torque Converter: Billet multi-disc converters manage higher horsepower and torque.
- Cooling & Pan: Deep aluminum pans (PPE, Mag-Hytec) reduce fluid temperatures, extending fluid life and transmission durability.
- Internal Hardening: Hardened input, output, and intermediate shafts add strength for high-power builds.
That said, the preventative maintenance changes are probably going to be what really helps out, but they are going to cost a bit more. From my understanding, transmission maintenance will be a LOT more frequent, not just a 150k mile service, but I've heard every 30-60k with a full flush and map reset along with doing a drive cycle..
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