10 speed transmission
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Fleet Mechanic
Joined: Feb 2015
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From: southwest missouri
10 speed transmission
Traded my 22 for a 25 both have 10 speed (I know thats all that comes in them ). My 22 would downshift hard not all the time but enough to mention it at each oil change. My 25 just did it for the first time. I only have 1700 miles on it. Is this common to these 10 speeds?
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From: Southern California
If you go to nexgen, they have a full explanation of what is happening
Next Gen Drivetrain, Inc. | Proudly Veteran Owned & Operated
As you know, the 10 speed was a joint Ford/GM project that ended abruptly when engineering disagreed. GM's software aggravated the problems; Ford's software helped a little, but the 10 speeds have issues that are ultimately by a pulse valve- what does this valve really do- when asked, Ford nor GM engineers will explain. What is known is this is what causes most of the drivability issues and trans failures. GM is being sued over this right now, Ford IMHO, will not be far off.
The solution is to replace the valve body with a modified unit that replaces ALL of the plastic valve actuators and deletes the pulse valve completely.
Next Gen Drivetrain, Inc. | Proudly Veteran Owned & Operated
As you know, the 10 speed was a joint Ford/GM project that ended abruptly when engineering disagreed. GM's software aggravated the problems; Ford's software helped a little, but the 10 speeds have issues that are ultimately by a pulse valve- what does this valve really do- when asked, Ford nor GM engineers will explain. What is known is this is what causes most of the drivability issues and trans failures. GM is being sued over this right now, Ford IMHO, will not be far off.
The solution is to replace the valve body with a modified unit that replaces ALL of the plastic valve actuators and deletes the pulse valve completely.
Logistics Pro
Joined: May 2021
Posts: 4,004
Likes: 2,329
If you go to nexgen, they have a full explanation of what is happening
Next Gen Drivetrain, Inc. | Proudly Veteran Owned & Operated
As you know, the 10 speed was a joint Ford/GM project that ended abruptly when engineering disagreed. GM's software aggravated the problems; Ford's software helped a little, but the 10 speeds have issues that are ultimately by a pulse valve- what does this valve really do- when asked, Ford nor GM engineers will explain. What is known is this is what causes most of the drivability issues and trans failures. GM is being sued over this right now, Ford IMHO, will not be far off.
The solution is to replace the valve body with a modified unit that replaces ALL of the plastic valve actuators and deletes the pulse valve completely.
Next Gen Drivetrain, Inc. | Proudly Veteran Owned & Operated
As you know, the 10 speed was a joint Ford/GM project that ended abruptly when engineering disagreed. GM's software aggravated the problems; Ford's software helped a little, but the 10 speeds have issues that are ultimately by a pulse valve- what does this valve really do- when asked, Ford nor GM engineers will explain. What is known is this is what causes most of the drivability issues and trans failures. GM is being sued over this right now, Ford IMHO, will not be far off.
The solution is to replace the valve body with a modified unit that replaces ALL of the plastic valve actuators and deletes the pulse valve completely.
Irony abound that the 6R transmission Ford used and 6L family GM ran were all more or less based on the ZF 6HP and overall became very trusted, but then Ford and GM thought they can do better by not copying the 8HP which while not perfect(some issues with long term sensors being expensive to fix when they go down) arguably would have been better basis for when Ford and GM wanted to go beyond 6 forward gears, as the implementations in FCA/Stellantis vehicles have shown.
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Joined: Aug 2002
Posts: 6,103
Likes: 383
From: Southern California
That was a good read, thank you. I'm glad Next Gen doesn't pull any punches and tells it like it is.
Irony abound that the 6R transmission Ford used and 6L family GM ran were all more or less based on the ZF 6HP and overall became very trusted, but then Ford and GM thought they can do better by not copying the 8HP which while not perfect(some issues with long term sensors being expensive to fix when they go down) arguably would have been better basis for when Ford and GM wanted to go beyond 6 forward gears, as the implementations in FCA/Stellantis vehicles have shown.
Irony abound that the 6R transmission Ford used and 6L family GM ran were all more or less based on the ZF 6HP and overall became very trusted, but then Ford and GM thought they can do better by not copying the 8HP which while not perfect(some issues with long term sensors being expensive to fix when they go down) arguably would have been better basis for when Ford and GM wanted to go beyond 6 forward gears, as the implementations in FCA/Stellantis vehicles have shown.
Logistics Pro
Joined: May 2021
Posts: 4,004
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Don't get me wrong, I have plenty of gripe against ZF mostly regarding their repairability and parts availability when something does go wrong, and they had their share of issues with their 9 speeds. But in the contemporary context, the 8HP/Powerline family is the least bad option by a long shot. Heck, Ford STILL supplies the 6R140 behind the PSD and 7.3 gas v8 to their chassis cab division and outside customers like Bluebird buses.
Trailering
Joined: Feb 2026
Posts: 15
Likes: 8
Yes, this is pretty common on the 10R80 in the 2021-25 F150. The hard downshift is usually torque converter lockup cycling at low speed -- the transmission is trying to stay in a higher gear to improve fuel economy and then has to snap back. Ford has released several TCM calibration updates over the years for exactly this. Worth asking the dealer to check if your TCM is on the latest calibration before assuming it is mechanical. The 25 should have the latest from the factory but I have seen a few that did not get updated before leaving the lot.
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