My 2010 F150 randomly feels like I'm driving over the rumble strips as well as a small jerk like there is a cylinder misfire. If keep it at constant speed it still happens, but under cruise control it stops. Even when load increases like going up a hill.

 

Welcome to FTE!

Your description sound similar to when transmission fluid begins to break down and the transmission begins to slip a bit. But, it's likely more of an electronic issue.

Is your truck the 4.6L 2V with the four speed transmission or the 4.6L3V with the six speed? Both were offered in 2009/10. 4x4 or 4x2?

How many miles? Are you the original owner?

More info will get yo more replies.

 

I am having the same problem.
Are you talking about an electronic problem in the transmission or the engine?
Mine is a 4.6L3V with the 6 speed
It has 174000 miles on it
I just bought it, ran smooth for a day then I felt the vibration.

 

205k. Second owner. 4x2. 4.6L 3V
In my research, I have found lots of mentions to the torque converter in relation to the sound and vibrations, but not all of the symptoms match.

 

coil pack maybe? Are you sure its not a misfire...

 

New coil packs, new plugs, no CEL, and no DTC

 

I changed out plugs and coil packs.. no change
Come to find out its a transmission problem..
Will update on what's next
and mine is a 4.6L SOHC

 

Just an update
It was the transmission
Was going to cost me $3800 to rebuild it.
They put some Mr Shuttterfix in it and it seems to being working fine now
Not sure how long it will last, but hopefully will be a permanent fix


As anyone else used this "miracle" stuff?

 

If a bottle of shudder fix made the problem go away, then your best bet is a fluid exchange.


If it were mine, I'd do a fluid exchange with a synthetic transmission fluid and hope for the best.


my 95 t-bird had the infamous torque converter shudder. two different shops told me that it needed a new torque converter, and while I was there I should just go ahead and rebuild it.


a fluid exchange with mobil 1 synthetic ATF fixed the problem and it has not returned since.


if I were to do it again today I'd probably use amsoil OE fluid, since you can get a better deal buying it by the gallon.


if the problem returns after the fluid exchange, you can always put something in it again, but I think new fluid will be the best fix. if I were going to add something to the fluid, which I would only do as a last resort, I'd look at the lube-guard product line.


there are those that say changing the fluid might kill your transmission. I'd counter that with *not* changing your fluid *will* kill your transmission. Not maintaining the fluid condition is what causing your problem ... how is leaving that same fluid in the system better than getting new fluid in there.


don't use chemical cleaners. just exchange the fluid.


keep us posted with what ever you end up doing.

 

I was told "after many discussions" that with the miles (175000) on oil flush and change would not be wise
Thanks for the discussion

 

that's the other side of the coin.


I always answer the unknowns from the "what would I do if it were mine" approach, and I'd do a fluid exchange.


I've been told that doing a flush after 100,000 miles is the worst thing you can do. yet every vehicle I've had was flushed around that mileage and I've never had anything but good results.


IMO, new fluid is the only hope you have of saving the trans. it may already be too late, but I'd take the gamble on new fluid.


replace the word "transmission" with "engine" and see if your opinion changes. Would you refuse to change the engine oil at 40,000 miles just because it had never been changed? Or, would you change it and hope for the best?


I just can't understand how leaving old, worn out, saturated oil in any mechanical device does more good than harm.... it just doesn't make any sense. if the fluid is used up then it needs new fluid.


just an opinion. not a baseless opinion, but an opinion, nonetheless.

 

*UPDATE

Just got back from the trans shop. It was the bridge seal between the valve body and the pump. Failure of the seal is common on the 6R60 transmission. Causes low transmission fluid pressure and gear slippage. I got all new synthetic trans fluid and a new filter with it. Drives like a completely different truck.

 

Check into the bridge seal. As was mentioned above, a fluid exchange is your best course of action if the problem was solved by a $6 additive. When they replaced my seal I got new fluid and filter anyway, but it sounds like we have the exact same transmission and mine has a few more miles on it, so stands to reason it could be the same problem.

 

Glad you got yours resolved!

Motor on, brother!

 

Hope my problem is the same. 2007 Sport Trac 4.6 6speed cycling shudder at 40-45 mph 1800 rpm sounds like running over rumble strips. RPM raises just slightly as rumble occurs. Cancel OD it stops. Get over 2000 rpm it stops. It just started doing it so we haven't driven it. Thanks for following up with your Trans Guy's cure!