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Rearend howel
Old April 14th, 2017, 06:39 AM   #1
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Rearend howel

Searched and found some stuff on this but nothing like my case.

I had a slight whine/howel upon acceleration at around 50mph coming from what seemed like the trans but probably was the rearend and it wouldn't happen all the the time just sometimes. Not a big deal as i was going to do gears anyway.

Well now i had the rearend rebuil by local 4x4 shop with the new gears and all new bearings etc.

And now it howels Everytime time under light/hard acceleration around 50mph and i think it is louder now too.. The shop owner drove it and said it was the transmission. But i know the diff is closer than most people realize.

Im fuked aren't I?
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Old April 14th, 2017, 06:45 AM   #2
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Would that be Mr. Howel or Mrs. Howel?




Just be thankful your rear end doesn't howl. THEN you would be fucked.
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Old April 14th, 2017, 06:57 AM   #3
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What was your break-in procedure for the new gears? If they said no, our gears don't have to be broken in, then yes, you were fucked by them.

Also, if it was your pinion bearing going out (the howeleng) and they reused the pinion bearing, then you were fucked by them.

Pull a sample of the gear oil and send it out. It's like $35 for the analysis.
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Old April 14th, 2017, 08:04 AM   #4
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Soooo....before rear rebuild it only happened sometimes but now after "rebuild" it happens all the time?
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Old April 14th, 2017, 08:09 AM   #5
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Soooo....before rear rebuild it only happened sometimes but now after "rebuild" it happens all the time?
I'd pull the cowel and make sure a plug wire didn't get bumped loose
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Old April 14th, 2017, 10:34 AM   #6
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1.Unitrax gears...like 500 mile break in i think
2.I have driven it 20 miles so far.
3. I bought the unitrax rebuild kit dosent that come with a new pinion bearing?
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Old April 14th, 2017, 10:42 AM   #7
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Originally Posted by Richard Stihl View Post
1.Unitrax gears...like 500 mile break in i think
2.I have driven it 20 miles so far.
3. I bought the unitrax rebuild kit dosent that come with a new pinion bearing?
1) Did they start howling immediately?
1a) Are you following the correct break-in procedure? Two very mild 20 minute drives followed by a COMPLETE COOL DOWN each time then mild driving for the rest of the 500 miles?
2) 20 miles should comprise the first heat up and cool down stage of the break-in procedure. Assuming you are following it.
3) Did you watch them install it?

Question 1) is the most important here. Unless you nailed it the first time you got in the car. At which point the break-in process is the issue.
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Old April 14th, 2017, 11:05 AM   #8
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I was gentle for the 20 miles then i parked it. I guess i thought it was a 20 mile drive then let it cool. Not the 2 cycles of driving it for 20 minutes and letting it cool in between.

So far all ive done is put 20 gentle miles on it. The howeling started almost right away.

And noi didn't watch them do it.
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Old April 14th, 2017, 11:12 AM   #9
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If the howling started immediately then it's likely a build problem with the diff. Or the transmission as mentioned. Change your transmission oil. Or at least drain some out and get a looksie at it.
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Old April 14th, 2017, 01:38 PM   #10
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I've seen shops do this and never put a drop of oil back in it. I've seen the same bearings be re-used, I've seen them bolt the cover to the housing with an impact gun, I've seen them put the cover on without even putting a gasket or any kind of RTV on it, I've seen them not clean anything while they went through it.....all of which is a problem. nevermind the clearances required. if it's howling, a bearing is already fucked somewhere at a minimum.
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Old April 14th, 2017, 02:47 PM   #11
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Mother F
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Old April 14th, 2017, 02:52 PM   #12
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before you go jumping through hoops, have you checked wheel bearings? they will make a hell of a roar too.
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Old April 14th, 2017, 04:00 PM   #13
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When my front hubs went out they just squeaked. I suppose the rears could be quite different tho.
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Old April 14th, 2017, 04:08 PM   #14
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When my front hubs went out they just squeaked. I suppose the rears could be quite different tho.
I've done dozens of them on various vehicles, one of my personal cars that I had to find was my 99 cobra. both front wheel bearings went about the same time. the exhaust kinda covered the sound at first, and no squeaks at all, but about 40mph it would start and become deafening at 60. I was in germany when it happened. it was so bad that when I got to the craft shop to check it out I went to turn my tires by hand and it felt like little indentations (think like the scroll wheel on a mouse kind of indentations) it was terrible. luckily those are REALLY easy replacements, unbolt, bolt new on (with new studs already on it) pricey though, like 200 a pop if memory serves me correct.
best way to describe the roar, it was similar in a jeep we had at the shop with 44inch aggressive mudders going down the highway.
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Old April 14th, 2017, 04:44 PM   #15
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What's all this about Howell causing a problem?

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Old April 14th, 2017, 05:09 PM   #16
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Something else worth mentioning i guess is i bought some new slotted and dimpled rotors from the viperstore (viperstore brand). Put them on and took a 400mile trip. it was on that trip that i first started to notice the howel upon light acceleration at cruising speed and an annoying vibration in the gas pedal an d steering wheel at 80 mph.

All of this was prior to the rearend being rebuilt.
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Old April 14th, 2017, 05:32 PM   #17
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Dude. Please. It's HOWL. There is no e in the correct spelling.
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Old April 14th, 2017, 05:33 PM   #18
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Oh. And back on the help wagon... Yes, check your hubs. They are easier to diagnose than a transmission and cheaper and easier to change too.
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Old April 17th, 2017, 08:32 PM   #19
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hubs were ok...

Changed tranny fluid today It had ATF in it and it looked sort of ok (not really sparkly at all). I put Amsoil manual transmission lube in it. No change

Here's a video



I talked to John Donato and im probably going to send the trans to him but first im going to take it in tomorrow and have the diff fluid changed. It has 70miles on the new rearend gears now. So i imagine if it is the pinion bearing the fluid should be full of metal by now.
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Old April 18th, 2017, 02:42 AM   #20
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If you change gears does the pitch go up or down? That could suggest tranny versus diff.
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