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Old 07-05-2009, 11:51   #1 (permalink)
Bigb99
 
Join Date: Jun 2008
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mad Roar from Rear End upon Deceleration

My 2001 Expy EB with 5.4L engine was leaking gear oil 3 weeks ago when I was out of town. I took it to a local mechanic who said he changed the oil and replaced the pinion seal. After about 300 miles, I heard a roaring sound from the rear end, and when I checked the oil, it was low (could barely reach it with my little finger).

I decided to remove the oil rather than top it off, and I found that it was black colored and had some tiny flecks of varnish looking stuff in it. I now know that I should have removed the diff cover and cleaned it out, but I just refilled it with synthetic oil plus an additive. It didn't help the noise at all, and I believe the mechanic took this woman for a ride.

The noise sounds like an airplane engine winding down, and it only occurs when I take my foot off the accelerator. At least, I can't hear it if it occurs while I'm accelerating. I've never worked on a differential, and after reading everything I can find, it's beyond my expertise.

Am I right in assuming this is a problem with the differential?
How much should I expect to pay in the Houston area?
How do I find a reputable shop to do the work?

HELP PLEASE!
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Old 07-06-2009, 06:59   #2 (permalink)
Bigb99
 
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Re: Roar from Rear End upon Deceleration

I was sure hoping to get a reply before I had to drive my truck.
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Old 07-06-2009, 07:24   #3 (permalink)
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Location: Arkansas
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Re: Roar from Rear End upon Deceleration

Somethings definitely wrong. I'm curious, what kind of lubricant did the mechanic use for refill? Should have been 75W-140 Synthetic Rear Axle Lubricant with 4oz Friction Modifier.

I really don't know who you could take it to other than a local Ford Service dept or a garage that specializes in rear differential repairs.

If a rebuild is necessary, you might want to consider a used rear end from a local salvage yard.
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Old 07-06-2009, 09:33   #4 (permalink)
Bigb99
 
Join Date: Jun 2008
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Smile Re: Roar from Rear End upon Deceleration

Thank you for getting back to me. I just got back from taking the truck to a drivetrain shop, and they said the mechanic probably set the preload too high, but they will call me this afternoon to let me know.

The mechanic said he used the 75-140 synthetic, but I'm beginning to think he didn't change the fluid but probably topped it off.

Thank you again.
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