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Old 11-13-2013, 06:04 PM   #1
3tooln
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Howling rear when acelerating

Hi. I have a Eaton rear in my 72 Suburban that is howling when I acelerate.
Im told its the pinion seal.
Anyone know what kind of cost I am looking at to get this correct ?

Thanks. TjW
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Old 11-13-2013, 07:58 PM   #2
Longhorn 70
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Re: Howling rear when acelerating

I really haven't heard seals make things "howl". Pinion bearing maybe? Ring and Pinion contact could be? Low on gear oil? I am just guessing.

Actually you can do the seal yourself if you are careful. The way I've done it in the past with a friend was
Remove the drive shaft
Heat the Pinion nut with a torch to expand the nut
Get someone to hold the brakes tight
Big breaker bar and I seem to recall 1 5/16 socket to remove nut This took 2 of us pushing on the bar in the day
Use a puller to remove yoke from pinion shaft
Pull old seal out and tap in new
Install old pinion yoke and NEW nut
Torque to spec. Do not overtighten.

Best of luck.
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Last edited by Longhorn 70; 11-13-2013 at 08:04 PM.
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Old 11-13-2013, 08:04 PM   #3
terry b
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Re: Howling rear when acelerating

Is it leaking gear lube from the pinon seal?
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Old 11-13-2013, 08:41 PM   #4
swamp rat
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Re: Howling rear when acelerating

Seals don't howl, its probably improper gear mesh..
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Old 11-13-2013, 09:39 PM   #5
Tom Vogel
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Re: Howling rear when acelerating

Your diff may be on its way out.
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Old 11-13-2013, 09:48 PM   #6
Longhorn 70
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Re: Howling rear when acelerating

Good news. Pull the axles, pull the drive shaft, pull the carrier, put it on the bench or take it to the shop.
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1970 Longhorn, Front Disc, 350/4 bolt, 882 heads, HEI, Edelbrock, 700R4, HO-52/4.11.
1996 Corvette, Collector Roadster, LT4, 396, 450RWHP, 6sp, 4.11/Dana44/posi 5 point roll bar

And let us not grow weary of doing good, for in due season we will reap, if we do not give up. Gal 6:9
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Old 11-13-2013, 10:02 PM   #7
terry b
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Re: Howling rear when acelerating

If your pinon bearings are on the way out the pinon gear will want to climb the ring gear. This adds alot of load to the gear set and makes noise. If the pinon bearings are loose you may see gear lube seeping past the seal. Drain the lube by removing the cover and take a look inside. Look at the ware in the teeth then go online and check the pattern and see whats up. If you unhook the drive shaft you can twist the yoke and check back lash. At least how much **** is floating around in there and you can go thicker lube to get by for a short time.
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Old 11-14-2013, 08:49 AM   #8
Keith Seymore
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Re: Howling rear when acelerating

Here at Truck Engineering we have a saying...

"...a 'singing' axle is a happy axle..."

(lol)

Seals don't make an axle howl. As mentioned, improper gear mesh/low oil/failing axle are the usual culprits.

K
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