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Old 03-19-2013, 08:56 PM   #29
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Originally Posted by Gary - K7GLD View Post
Bad wheel bearings rarely, if ever, will whine on acceleration, but not on deceleration - they will usually just whine ALL the time...

A differential whine under acceleration that quits when decelerating - or the other way around, is usually either poor gear lash adjustment, or worn gears...
Best answer above! It can be adjusted which will make it better if you dont have too much wear. If too worn they may need replacing.

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Old 03-19-2013, 09:24 PM   #30
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You asked for price info:
I had to have the differential on my '02 Endeavor rebuilt or replaced about 2 years ago.
The local Allison distributor (Pacific Power) who finally diagnosed my problem quoted me several alternatives:

Full replacement with new: about $4500 parts & labor, full 2 year warranty on everything, but it would take 3-4 months due to lack of availability and the next scheduled production run.

Full replacement with remanufactured: about $3500 parts & labor, full 2 year warranty on everything, and it would be done before the weekend (diff. distributor had the reman units in stock).

Rebuild mine: about $3500 labor, + whatever parts were needed. Warranty - 90 days on parts replaced, and it would take about 2 weeks.

(Why the Allison distributor? Because the driveshaft shop gave the u-joints a clean bill of health, and the differential shop checked it over and said it was fine and the problem must be in the Allison. Pacific Power listened to it, swore the Allison couldn't make a noise like that, opened up the drain plug on the diff. and the magnet on the plug pulled out a 4 inch long chuck of one of the ring gear teeth - won't go back to that diff. shop again - Pacific Power all the way for driveline problems...)

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Old 05-02-2013, 12:18 PM   #31
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Just curious, would switching to synthetic rear end fluid make any difference in prevention and/or helping if you already have the "whine"? I see someone mentioned switching to a higher weight fluid, isnt most rearend fluid 90 weight? Dont hold me to that, thats a guess since I havent changed my fluid in a few years. I do experience a slight whine but only under very heavy loads such as going up a steep grade when Ive had to downshift into 3rd gear.....but its had this for years and doesnt seem to be getting any worst. Id certainly switch to synthetic or a heavier weight lube if further damage could be prevented.....either way, Ill get under the MH, drain the fluid and check for shavings...then put the most desirble/useful fluid back in. In case your wondering, these are all questions????? LoL
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Old 05-02-2013, 09:13 PM   #32
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I had the rear dif go on my discovery and it only had 28000 miles, it as Mercedes rear on it and its a sealed unit and no parts available for it so I had a new one put in at the Freightliner dealer, thank god for that extended warranty. It was close to $5000.00 the bill to the insurance company. Joe
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Old 05-02-2013, 09:26 PM   #33
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Originally Posted by tquarles View Post
Pacific Power all the way for driveline problems...)
I've had our rig to Pacific Power in Ridgefield WA once. Will definitely go back if heavy repairs are needed. Had a starter go out on a Friday, they said it would be Monday before they could do it. Towed to shop and parked inside shop hooked up to shore power to keep the refer and freezer cold. Just before midnight on Friday they called and said it was ready!! Superb service although they did ruin my 12 amp 100' power cord at least they bought me a new one! The only thing I can think of is that when they drove it out of the shop the tech didn't realize it was plugged in drove off.
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Old 05-03-2013, 10:14 PM   #34
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Originally Posted by Gary - K7GLD View Post
U-joints will thump, grind, and rattle - but I've never heard one whine...
!00% right.I just replaced all my u-joints.I pulled the drive shaft myself and had the joints done for $250 with the center support bearing.I agree it sounds like the differential need to be replaced.
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Old 05-04-2013, 01:27 PM   #35
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i hear a whine when in the bedroom also like described when getting to speed and is there always as there is boost to keep speed.. but mine is deffinitly the turbo...but i would guess that he knows what a turbo sounds like eh? not to hijack its just a thought not brought up...just disregard if known..
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Old 05-04-2013, 02:08 PM   #36
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I wondered if it might have been the turbo. Had turbos on a couple of boats, but what even this was it was unacceptable. Kids wouldn't have been able to sleep there or watch TV. My son-in-law said he would just turn his hearing aid off if he wanted nap. At slower speeds, even under throttle it didn't make the noise hence decided it was the rear end vice the turbo. A function of the velocity and load on the gears. Does that seem reasonable to assume it wasn't the turbo.
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Old 05-04-2013, 08:14 PM   #37
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If it is the rear end making noise, Drain the fluid and put 80-140 wt diff oil in it. If it quiets down- some drain a gallon out of it and put a gallon of Lucas in it. I did a similar deal with a P30 chevy rear but in lesser amounts and it quieted it down quite a bit.

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