Clunk or aggressive shift
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4wd High
Joined: Jan 2025
Posts: 9
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Clunk or aggressive shift
I have a 2012 6.7 f350. At low speed or a parking lot crawl it will kick into 2nd gear with a clunk, this is only at low speeds and it’s more aggressive the slower I am accelerating. Normal acceleration it shifts into 2nd smoothly. Retuned it with no joy, still kicks. Any suggestions on what this could be?
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4wd High
Joined: Jan 2025
Posts: 9
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127k miles, I’m not too sure when the transmission fluid has been changed since I bought it at 120k miles. However the transmission fluid looks good.
Laughing Gas
Joined: Dec 2016
Posts: 764
Likes: 183
From: Knightstown Indiana
The first place I’d start is drain, top off, drive it to hot then repeat. It’ll take a total of about 12qts of ULV. When you drive really easy pressures are lower and stiction in the valve body can cause more abrupt shifts. New fluid has better lubricity and that might improve
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