Shudder when turning from stop only
Thread Starter
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More Turbo
Joined: Feb 2006
Posts: 698
Likes: 0
From: Cypress, TX
Shudder when turning from stop only
My buddy just picked up a 2004 f150 fx4 5.4l. The only issue we are having is a shudder from what i think is the rear end upon turning either direction from a dead stop. With the wheel point straight it is smooth. Rolling while turning it is smooth also.
What could this be?
What could this be?
Fleet Mechanic
Joined: Aug 2002
Posts: 1,899
Likes: 29
From: Raleigh USA
Your limited slip clutches are sticking. Put 2 bottles of ford friction modified in the rear end and drive around in figure 8s for a few minutes. If that don't fix it you will need new clutches.
Hotshot
Joined: Nov 2008
Posts: 15,014
Likes: 35
From: Semper Fi tell I die!
how much was the bottle? i put in some orielys part store friction modifier.
cant tell if its working but it aint made the sound but its glare ice all over the streets
Uploaded with ImageShack.us
cant tell if its working but it aint made the sound but its glare ice all over the streets
Uploaded with ImageShack.us
Thread Starter
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More Turbo
Joined: Feb 2006
Posts: 698
Likes: 0
From: Cypress, TX
No idea, my parts store girlfriend grabbed one off the shelf for me. cant be very much, couple bucks.
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Freshman User
Joined: Nov 2010
Posts: 49
Likes: 0
Hi Guys, I added (1) 4oz bottle of motorcraft brand modifier to the differential and it has cleared up about 80% of the problem, should I add another 4oz bottle?
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Postmaster
Joined: Jul 2010
Posts: 3,743
Likes: 2
From: Henrico, VA
Yes because when changing the fluid it calls for 8oz. I know you didn't change the fluid but you have lost the friction modifier and there fore should replace the total amount.
Freshman User
Joined: Nov 2010
Posts: 49
Likes: 0
Thanks Coskid..I will add another 4 oz bottle and if that fails I will drain and refill the differential with 75w140 instead of the provided 75w90.. I have not messed with the differential fluid yet as I have only added 4oz of modifier only. Thanks again
Senior User
Joined: Nov 2006
Posts: 310
Likes: 0
From: West Chester Pa.
I've had to do it twice.
I have about 100,000 miles on my truck.
I just change the oil and put the additive in it.
I didn't think to just add it to what's there.
I figure what's in there has got to be pretty dirty.
I have about 100,000 miles on my truck.
I just change the oil and put the additive in it.
I didn't think to just add it to what's there.
I figure what's in there has got to be pretty dirty.
Freshman User
Joined: Nov 2010
Posts: 49
Likes: 0
I would've changed the differential fluids but I only have 33K on the vehicle and probably will change the fluid if after adding another bottle it doesn't completely fix the shudder 100%. thanks for the advise though everyone!
Hotshot
Joined: Nov 2008
Posts: 15,014
Likes: 35
From: Semper Fi tell I die!
ya its not that hard to change the fluid instead of just adding the modifier,
1 drop cover and fluid,
2 clean and paint cover
3 put sealer on clean dry mating surface
4 reassemble
5 add friction modifier, then add fluid.
1 drop cover and fluid,
2 clean and paint cover
3 put sealer on clean dry mating surface
4 reassemble
5 add friction modifier, then add fluid.
Senior User
Joined: Nov 2006
Posts: 310
Likes: 0
From: West Chester Pa.
You just need to be sure to use the right sealant.
I use Permatex black silicone adhesive sealant.
http://www.permatex.com/products/Aut..._Sealant_b.htm
I also use that as an opportunity to paint the cover with Chrome paint.
It looks good for a while.
I use Permatex black silicone adhesive sealant.
http://www.permatex.com/products/Aut..._Sealant_b.htm
I also use that as an opportunity to paint the cover with Chrome paint.
It looks good for a while.
