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post #1 of 9 (permalink) Old 10-05-2010, 01:54 AM Thread Starter
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2008 super duty F350 single wheel rear

I have rear end problem 3.73 ford has rebult it twice and has started roaring noice again. can anyone give me any advice.
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post #2 of 9 (permalink) Old 10-05-2010, 03:40 AM
 
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Warranty on the rebuild? What sort of shop would rebuild an axle it and not warranty it if it goes after a year? or is there any abuse involved, cause its hardly a common issue with those axles. LR

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post #3 of 9 (permalink) Old 10-05-2010, 01:00 PM
 
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I'd go after rebuilder too. Like LR says, you just don't see problems with rear diffs. Is everything straight, like driveshaft, axle shafts, axle housing, frame...this may play a role.


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post #4 of 9 (permalink) Old 10-05-2010, 04:08 PM
 
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is a howl on accel or decell or all times?


a moments silence for the shelbyx,i hope her new owner enjoys as much.
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post #5 of 9 (permalink) Old 10-08-2010, 12:52 AM Thread Starter
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The ford dealer in little rock Ar. i travel a lot my truck has 159,000 on the . the howl is at 55 mph.
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post #6 of 9 (permalink) Old 10-08-2010, 03:23 AM
 
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Sounds to be a faulty rebuild, I have never heard of a f350 with a bad rear end, my Dad has a 2000 f250 4x4 with 350000 km on it and we load the crap out of the truck plus we abuse it in the winter, and nothing from the rear end nice and smooth quiet

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post #7 of 9 (permalink) Old 10-08-2010, 03:38 PM
 
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Quote:
Originally Posted by speed711 View Post
The ford dealer in little rock Ar. i travel a lot my truck has 159,000 on the . the howl is at 55 mph.
at 55mph could be a gear pattern concern,best to take the cover off and use some gear paint(or just grease)on the gear teeth,rotate the gears into and out of mesh and see if the pattern is centered.


a moments silence for the shelbyx,i hope her new owner enjoys as much.
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post #8 of 9 (permalink) Old 10-09-2010, 09:41 AM
 
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Most likely, when they rebuilt it, the crown & pinion were worn funny and they didn't replace them. If they just replace bearings & seals and set it back up, the gears will pull themselves out of alignment again to follow the original pattern. I've been down that road on my 2003. The dealer did the rear end at 58,000KM. I took a large 5th wheel out to AB, then went on to the coast and then home. There was noise in it again only 2 weeks after rebuild. They rebuilt it a second time and by 98K when it needed doing again, they refused under warranty ( the Bast*** used an out of warranty adjustment the second time so they didn't have to pay for their mistakes).
I took it to my own dealer in Brockville, and he fixed it with a new C/P set and explained to me what had happened. C/P are not that bad, under 300 bucks which considering the cost of the whole rebuild, cheap insurance money.
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post #9 of 9 (permalink) Old 11-23-2010, 11:03 AM
 
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After an hour of highway driving - check the diff for heat ( touch the housing with your hand and see if it feels hot ). I might be warm but if it burns your fingers then I think there is a mechanical issue (bearing etc). I also think that the correct "Ford" diff oil is important. If everything checks out then I agree with the previous posts that the mesh contact is mis aligned. Is there ant excessive howl in reverse or de-celeration (without using the brakes) ?

Good Luck
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