What the ???????????
Thread Starter
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
What the ???????????
I started a thread titled "Shudder" and it seems to be gone?
This is the second disapearing thread Ive had in the last month.
Anyone else had or know anything about it?
So anyway Ill try again about shudder.
My 99 F-350 4x4 dually shudders when backing up almost like when you try and turn to sharp in 4x4.
I thought it was the brakes so I took it to a shop for a brake job.
They took off all the wheels and said everything was fine.
The mechanic suggested transmission troubles so I took it to a tranny shop.
The tranny guy said the posi in the rear end is doing it?
Took it back to the first mechanic and hes sticking with his tranny story.
Anyone hasve any opinions or ideas?
This is the second disapearing thread Ive had in the last month.
Anyone else had or know anything about it?
So anyway Ill try again about shudder.
My 99 F-350 4x4 dually shudders when backing up almost like when you try and turn to sharp in 4x4.
I thought it was the brakes so I took it to a shop for a brake job.
They took off all the wheels and said everything was fine.
The mechanic suggested transmission troubles so I took it to a tranny shop.
The tranny guy said the posi in the rear end is doing it?
Took it back to the first mechanic and hes sticking with his tranny story.
Anyone hasve any opinions or ideas?
Post Fiend
Joined: Sep 2003
Posts: 6,096
Likes: 27
From: Mesa AZ
If it was me, the things I'd suspect in order are:
If you have already checked the first two....then you might try mounting a video camera under the bumper, aim it at the location where the axle is connected to the leaf springs and then record a back up sequence. If there is any movement then you might have a broken locating pin on the spring pack.
I am just taking wild guess here....
Hope you find the solution soon.
- Parking brake
- limited slip friction modifier deficiency
- springs/suspension
If you have already checked the first two....then you might try mounting a video camera under the bumper, aim it at the location where the axle is connected to the leaf springs and then record a back up sequence. If there is any movement then you might have a broken locating pin on the spring pack.
I am just taking wild guess here....
Hope you find the solution soon.
Thread Starter
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Cargo Master
Joined: Aug 2004
Posts: 3,455
Likes: 8
From: Williams Lake B.C.
Im thinking the same , the tranny guy sounded pretty sure it was rear end related.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
it would chatter making turns on a hard surface.
Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Maybe, or what about, if the rear-ends' been re-geared but not shimmed correctly. Would it last this long or be heard going down the road? He can hear it backwards since speed isnt in equation?
Tuned
Joined: Oct 2011
Posts: 282
Likes: 0
Mine is doing the same thing. I would be willing to bet that it is just the rear end needing the friction modifier as stated. It seems to do it worse in reverse compared to moving forward. The last time mine did it, the modifier was added and it went away. I am getting ready to replace the rearend oil so that is why I haven't added the modifier to mine yet.
Buy the 4oz bottle and add a few ounces to start. Then if it is still doing it, add another once at a time untilled it goes away. You can do a search on the subject and you will find all the details.
Hope this helps.
Buy the 4oz bottle and add a few ounces to start. Then if it is still doing it, add another once at a time untilled it goes away. You can do a search on the subject and you will find all the details.
Hope this helps.
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