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Old Jul 11, 2007 | 09:53 AM
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drivetrain slack

My 2003 F250 6.0L TURBO Diesel is making a "Thunk" upon accelaration from being stopped in forward or reverse. I have had the vehicle checked out and I looked myself to check for universal joint wear, leaf spring bushing wear, transmission mount wear, and even for stuck brake calipers to determine weather or not there is a problem.
The vehicle is under warranty (87,000 miles) and I took it into Planet Ford (houston) and was told that everything looked good and sometimes it is normal for trucks to do this. I was told:
"......A little slack in the torque converter, a little slack in the driveshaft, a little slack in the differential; you know, they all add up and our technician says that its normal. Don't worry you have nothing to worry about."
I had assumed that someone would have opened up the plate on the back of the differental and look for metal shavings, but no one had touched it, figuring there may be some wear between the ring gear the gear on the inside (pinion gear? I'm not sure the name!!)
Now this sounds like buckshot to me and I haven't found any Technical Service Bulletins regarding this....Any of y'all heard anything like this or experienced this at all?
 
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Old Jul 11, 2007 | 10:23 AM
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From: Spring Lake
I have 120K on my truck and it experiences the same symptoms. There is a TSB pertaining to what you've described about the slip yoke not being sufficiently lubricated.
 
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Old Jul 11, 2007 | 10:25 AM
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Forgive my lack of knowledge, where and how do I lubricate the slip yoke?
 
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Old Jul 11, 2007 | 10:26 AM
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Get a tube of Ford's blue grease from the Stealer. They call it XG-8 PTFE Lubricant, and it comes in a 3 ounce tube.

Pull the rear driveshaft and lube the splines that connect it to the front driveshaft. Put a big tie wrap around the boot to re-seal it from dust. Wha-La! No more "thunk"!

Pop
 

Last edited by SpringerPop; Jul 11, 2007 at 10:38 AM.
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Old Jul 11, 2007 | 10:34 AM
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From: Spring Lake
Originally Posted by SpringerPop
Get a tube of Ford's blue grease from the Stealer. Pull the rear driveshaft and lube the splines that connect it to the front driveshaft. Put a big tie wrap around the boot to re-seal it from dust. Wha-La! No more "thunk"!

Pop
Will it ultimatley damage the truck if I just let it be? I don;t like pulling driveshafts...
 
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Old Jul 11, 2007 | 10:41 AM
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I dunno, but I should think that anything that needs lubrication that's not getting it will eventually cause problems.

Around here, we're kinda' into PREVENTIVE maintenance. It's a reliability thing, and that's what caused most of us to get into diesels in the first place.

Pop
 
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Old Jul 11, 2007 | 10:52 AM
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From: Spring Lake
Originally Posted by SpringerPop
I dunno, but I should think that anything that needs lubrication that's not getting it will eventually cause problems.

Around here, we're kinda' into PREVENTIVE maintenance. It's a reliability thing, and that's what caused most of us to get into diesels in the first place.

Pop
I am too, but on the flip side, I am paranoid of working on my SD. All my older trucks parts were readily available and cheap... but with this thing, not so much. And everything I have ever done to the SD following my chilton's has only compounded the problems this big girl is having.
 
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Old Jul 11, 2007 | 11:07 AM
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Originally Posted by 5.4L to Freedom
Will it ultimatley damage the truck if I just let it be? I don;t like pulling driveshafts...
Yes, eventually it will damage the parts around your slip yoke, you'll probably see it start as a stress crack.

Super easy fix. Just follow these instructions.

http://www.eurekaboy.com/f250/slipjoint.htm
 

Last edited by redford; Jul 11, 2007 at 11:12 AM.
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Old Jul 12, 2007 | 12:22 PM
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Talking

you can tow with a 5.4L....I saw a trailer hauling an inflatable raft once...
Hey thanks for that blue grease info....the Stealer will probably charge above List price I'm sure. But that preventative maintainance is exactly the reason for the diesel.
 

Last edited by oldmanwilson29; Jul 12, 2007 at 12:25 PM.
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Old Jul 12, 2007 | 12:34 PM
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Originally Posted by oldmanwilson29
you can tow with a 5.4L....I saw a trailer hauling an inflatable raft once....
It was probably full of parts needed to get a PSD truck back on the road.
 
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Old Jul 12, 2007 | 10:33 PM
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Originally Posted by 5.4L to Freedom
I am too, but on the flip side, I am paranoid of working on my SD. All my older trucks parts were readily available and cheap... but with this thing, not so much. And everything I have ever done to the SD following my chilton's has only compounded the problems this big girl is having.
This truly is a simple job, get the grease (it's a really thick glue-like grease) and follow the instructions in this thread. For about a half-hour invested you can have that thunk gone permanently. The only thing to remember is to chock the rear wheels before you disconnect the driveshaft at the rear. Mike
 
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