Transmission problems
Thread Starter
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3rd Gear
Joined: Nov 2025
Posts: 3
Likes: 3
Transmission problems
Hi everyone,
Looking for help on my 2017 250 lariat 6.7. It has 170,000km.
I am having trouble with a 1-2, 2-1 and 5-6 shifts. The shifts are fairly harsh regardless of throttle input or temperature. No codes or issues with other gears. I have reset adaptive tables multiple times and did a fluid/filter change with no luck.
The shifts are better with exhaust break on or tow/haul mode. Even better when towing a trailer but still there.
Any thoughts?
Looking for help on my 2017 250 lariat 6.7. It has 170,000km.
I am having trouble with a 1-2, 2-1 and 5-6 shifts. The shifts are fairly harsh regardless of throttle input or temperature. No codes or issues with other gears. I have reset adaptive tables multiple times and did a fluid/filter change with no luck.
The shifts are better with exhaust break on or tow/haul mode. Even better when towing a trailer but still there.
Any thoughts?
Thread Starter
|
3rd Gear
Joined: Nov 2025
Posts: 3
Likes: 3
I replaced the fluid a couple weeks ago with no change to the problem unfortunately.
Laughing Gas
Joined: Aug 2021
Posts: 916
Likes: 512
Glad that took care of it and thanks for reporting back with the solution. Not everyone does and it is helpful to other members as well.
Bob
Bob
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,254
Likes: 763
From: Houston, Texas
Originally Posted by dicairem
I just put in a new oem valve body and it’s shifting perfect!
Keep up on your fluid changes every 30,000 miles. Dorman makes a pan with a drain plug to make the service easier. Always use Motorcraft Mercon LV, the parts store stuff may say it's compatible but it's too thin.
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