Transmission trouble

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Oct 20, 2024 | 10:27 PM

bgibson2334

Thread Starter

3rd Gear

Joined: Oct 2024

Posts: 3

Likes: 0

Transmission trouble

Hey guys, I’m having some transmission problems with my 2017 f250 6.7 145,000 miles. Truck has been on a weight loss plan with Ampd tunes. Downshift from 5th to 4th is extremely hard. Also a little bit of flare in 6th. And occasionally 1st to 2nd is a hard shift as well. From the information I’ve gathered from this page and other pages it’s looking like a valve body issue. Would be interested to see what you guys think about the issue. Also recommendations for a Valve body leaning towards SPE but wanted to check with you guys to see if you liked anything else better? Thanks in advance.

Oct 20, 2024 | 10:48 PM

muisejt

Tuned

Joined: Oct 2022

Posts: 275

Likes: 156

If you tuned the TCM I would look into that first

Oct 20, 2024 | 11:43 PM

Ltngdrvr

Lead Driver

Joined: Nov 2005

Posts: 8,459

Likes: 4,955

Quote:

Originally Posted by muisejt

If you tuned the TCM I would look into that first

Exactly, very likely the TCM tune was tweaked during tuning.

Oct 21, 2024 | 12:21 PM

WXboy

Logistics Pro

Joined: Sep 2002

Posts: 4,410

Likes: 1,016

From: Central KY

I'd start simple. Have you changed the trans filter? Most people neglect proper transmission maintenance. I don't care that the manual says you can go 150k. 150k is a LONG time on fluids.

If so, then I'd go to valve body next. 2017 trucks had a lot of valve body issues for some reason.

Third I'd load the STOCK transmission tuning and a 40 HP or less engine tune. AMPD will allow this, I verified with them a few weeks back that their stock transmission file is indeed a Ford OE transmission file.