tranny problem engine problem who know

Reply Subscribe

Thread Tools

Search this Thread

May 19, 2011 | 06:36 PM

polyautobody

Thread Starter

New User

Joined: May 2011

Posts: 3

Likes: 0

tranny problem engine problem who know

I have a 2007 f150 lariat with 88000 miles on it that i just bought and during slow throttle from 40-50 i am getting a sparatic shudder right when it goes into overdrive is worse when going up a light grade it goes away when i get to about 60 and whenever i give it full throttle it acts realy sluggish like the tranny is slipping but it shifts very smooth. any ideas?

May 19, 2011 | 07:13 PM

air1jpg

Tuned

Joined: Aug 2007

Posts: 492

Likes: 0

From: Louisville

Have the torque converter in the tranny checked... I had a Ranger that did this and it turned out to be the torque converter.

May 20, 2011 | 07:44 AM

hcbph

Senior User

Joined: Jul 2009

Posts: 379

Likes: 0

From: Minneapolis, Mn

Tranny issues

Also had something similar happen to my T-Bird. In my case it was an aluminum ring in the tranny wore/broke and filled the tranny with aluminum shavings, pan was full of them. I had to have a tranny rebuild in that case.

Hope yours isn't that bad. Good luck.

May 20, 2011 | 01:38 PM

polyautobody

Thread Starter

New User

Joined: May 2011

Posts: 3

Likes: 0

i heard that when you press the brake pedal the torque converter unlocks so i tried pressing the brake when it happened and the shuddering didnt go away could this be a tune up/ cop problem?

May 20, 2011 | 10:06 PM

air1jpg

Tuned

Joined: Aug 2007

Posts: 492

Likes: 0

From: Louisville

Quote:

Originally Posted by polyautobody

i heard that when you press the brake pedal the torque converter unlocks so i tried pressing the brake when it happened and the shuddering didnt go away could this be a tune up/ cop problem?

I would think that if it is a tune up /cop issue, the truck would shudder no matter what gear it was in. I have not heard abou the TC unlocking just becuase the brake pedal is pressed. Yours may not be locking up at all.

May 21, 2011 | 07:18 AM

Djack04F150XL

Senior User

Joined: Aug 2008

Posts: 298

Likes: 0

From: Vicksburg, MS

Have you changed the fluid and filter? If not its worth a try. I've had some do this and it cured the T/C shutter at low lockup speed.

May 21, 2011 | 11:24 AM

cb_13

Fleet Mechanic

Joined: Jul 2010

Posts: 1,509

Likes: 116

From: St James, Missouri

I know the 4L60e in chevy trucks would unlock the torque convertor when the brake was pressed and if the bpp switch went out it would not lock up at all. So that is not completely false but i do not know if the same function applies on these trucks. If you can easily duplicate it a good scan tool will tell u when the torque convertor is locked or unlocked. Even if you have to pay a diag fee that would point you in the right direction. If you decide to service it I would add a bottle of the motorcraft friction modifier it did wonders for shudder in the 4r70w ford transmissions.