When I’m at low rpm (under 2k) cruising I get this horrific shake like I’m riding on rumble strips. Once the truck upshifts it subsides.

Any idea what causes this?

-Also not sure if it’s related or not but truck feels like it’s falling apart at 75-80 MPH.

 

Torque converter shudder. I had it, put in the additive, now its gone.

 

Do you have aftermarket wheels?

 

Had that rumble as well during cruise and deceleration. New Drive shaft fixed it.

 

Good morning! Can you send over a private message with your VIN? I will look further into this for you.

 

Errr? Did Ford actually choose to start engaging on forums like these once again... or is this some form of spam/intel gathering?

 

That’s similar to what I did. Had exact same torque converter shudder issue. Put the Ford additive in it and ran it for 3 days(150 miles). Then did a complete trans fluid exchange with fluid machine. That was at 32k miles. No issues now at 82k.

 

Did you get the Cam Phaser reprogramming? Could it be the engine "Shudder" issue?

 

actually jus had that done

 

I am wondering the same thing but I said screw it and messaged them