bcb97

The clunk your getting is normal and a characteristic of the transmission. Many threads on that issue and lots of peoples trucks do it. Mine does it as well.

DignifiedDevin

Got the truck back, they replaced the fuel tank. That's not the issue. so since the left the Repair Order open I want it back in the shop next week. CT requires 3 visits under 20K for Lemon Law and FORD is not going to bypass it with their games.

CeeDee

Man, that sucks. New fuel tank and still didn't fix it. Damn. Does a new fuel tank include new sensors on it too? Or just the fuel tank keeping the same old sensors?

Did the mechanic investigate other probable things and probe around while he was up in there?

bcb97

If it’s fuel slosh it’s still going to do it with a new tank considering it’s the same design. I said if, not it is fuel slosh.

cody8417

Just outta curiosity, which dealer are you going to? I'm also in CT and experiencing the same issue.

Jaminb90

Try driving in reverse and taping the brakes at different intensities. I did this the other night and can recreate the same shudder that I feel while braking and driving forward. I'm almost 100% sure it is fuel slosh, and a lot of it. Mash the brakes hard and the whole truck will start rocking.

SSowinski

I had a loaner for a week that would have a small bump/shudder 1-2 seconds after being stopped at a light. My truck didn't do that but it happened every time with the loaner. Sounded / felt like the torque converter disengaging.

Since it was a 5.0L (and a loaner) and I only had the 3.5L I took the opportunity on multiple occasions to roast the tires over the course of the week I had it. By the time I returned it there was no bump / shudder at the stop lights anymore.

I think it was a glaze on the TC that I finally wore off (or finally mated / seated itself) that caused the issue. Bottom line = drive the hell out of it for a bit and see f it helps.

CeeDee

Now thats an idea that coincides with a previous theory I had on what this issue could be. Because it definitely doesn't feel like fuel sloshing around, as DignifiedDevin and I have established with our trucks.

SSowinski

Yep. From my understanding it'll hold a bit after you stop before it disengages. Sometimes if you let off the brake just as it's disengaging you "catch" it and it'll clunk into gear again as you start to creep along.

It also kinda explains it getting better after the burnouts.

I came from a 6sp manual in my last truck and the trannys in these Fords have always had me noticing weird and wonderful quirks about it logic. It's probably similar in all automatics just more noticeable in the Fords since the back end it lighter which amplifies the drivetrain "issues".

Either way it's still better than clutching in and out all the time for city driving and I'm getting used to it.

CeeDee

Yup. This is my first automatic truck. I'm getting too old for manual transmissions nowadays. I love having power windows too.

Just how do you get these trucks to do a nice little burnout, safely, without damaging anything? With all the computers, traction control, and stuff, I swear the truck fights me every time I (gently) try to get the rear end to kick out a little bit in a turn.