Differential howl, UPDATE
#119030
09/10/08 11:17 PM
09/10/08 11:17 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
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OP
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Posts: 3,698
NE Oklahoma
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What exactly causes differentials to whine? Mine howls so bad, coyotes were following me home last night.  Seriously, I noticed when I put it in, it appears to have a lot of backlash. Could that be the cause? Thanks
Last edited by Von; 09/30/08 01:45 AM.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Differential howl
[Re: Cudajon]
#119033
09/11/08 02:32 PM
09/11/08 02:32 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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Quote:
Von, it would really help if you explained what kind of rear end your talking about, but lets assume its an 8 3/4. The pinion was probably not installed correctly with the crush sleeve being torqed to proper specs. This allows the pinion to tighten up changing the alignment with the ring gear (backlash). This is why most rear end rebuilders use a spacer on the pinion and toss the crush sleeve. This is a common problem. There are other reasons the rear end can howl but this is most likely on a new setup.
Sorry about that, it is an 8 3/4.
The chunk is not new. I had it set up 15 years or so ago. I dont remember it howling so bad before.
I did pull the yoke off and used it on another chunk? Maybe I didnt get it torqued right??
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Differential howl
[Re: bobby66]
#119034
09/11/08 02:33 PM
09/11/08 02:33 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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OP
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Quote:
Might check the end-play on the axles, too. Maybe they just need adjusting. 
They are aftermarket axles with green bearings.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Differential howl
[Re: 540challenger]
#119036
09/11/08 02:54 PM
09/11/08 02:54 PM
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Joined: Nov 2007
Posts: 21,822
Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Posts: 21,822
Kirkland, Washington
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Quote:
Which case do you have??
489 have a crush spacer it should be replace everytime you have the yoke off.
 and on that note Von--IF its a 489 case I would be pulling it immediately and inspecting. If the teeth still look good I would re-install with the available non-collapsable spacers. The howl may be from a destroyed pinion bearing, or it may be the ring an pinion itself. You will most likely be able to tell. I would not continue to drive it.
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Re: Differential howl
[Re: 540challenger]
#119039
09/11/08 06:02 PM
09/11/08 06:02 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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Quote:
Which case do you have??
489 have a crush spacer it should be replace everytime you have the yoke off.
It is a 489 case.
The howling is more noticeable when decelerating. It barely makes any noise under load, but screams when you lift.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Differential howl
[Re: dogdays]
#119041
09/11/08 11:20 PM
09/11/08 11:20 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
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Carstairs, Alberta, Canada
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Quote:
In my humble opinion, once the gears start to be noisy you might as well replace them because they are never going to be better. Hypoid gears mesh in a very particular way. New bearings, a spacer, and new gears are probably required to make things right.
R.
This is correct. Typically when a gear set that has been run for some time starts to howl, it always will.
You can try doing the set up over again, and get the pattern text book. BUT even if you do, you've changed it from what it was, so it could even howl worse when your done.
If it's really bad now it's worth a shot.
Are you sure the pinion has a lot backlash, and not a lot of endplay? Endplay would mean the peload is no longer there. (bearing failure, or problem with the yolk install.
The pinion gear walking in and out can cause damage to the gear set also(back to replace the whole smear)
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Re: Differential howl
[Re: TJP]
#119043
09/30/08 01:45 AM
09/30/08 01:45 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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NE Oklahoma
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Finally got a chance to pull my third member out. The pinion bearing looks OK, but the inside edges of the ring gear almost look like they have blued, The edges are also slightly rounded.
Does that sound like the result of taking the yoke off without installing a new sleeve?
Also, by my poor description of the above, will the gears live, howl, etc?
Thanks
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Differential howl
[Re: Von]
#119044
09/30/08 09:08 AM
09/30/08 09:08 AM
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Joined: Jan 2003
Posts: 4,820
near Alexandria, VA
Gas_Bandit
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near Alexandria, VA
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I bought a rear from someone once that had 4.56s in it (8 3/4) and it had the most horrible howl ever. Same thing, edges of the ring gear teeth were rounding off. This tells you your pattern is WAAAAAY off. If you run gears for any length of time with the pattern not set up right, you are never going to get the gears to set up and run quiet again. There is no way you are going to get gears grinding on the edges of each other quiet again. New gears time.
2003 Mercury Marauder, 34k miles, 3.73s and custom flash tuned
1981 Camaro, 350 w/ Holley Stealth Ram MPEFI, Sportsman heads, roller cam, self-burned chips, wideband O2
1983 Firebird TA
1993 Saturn SL2 83k
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Re: Differential howl
[Re: Von]
#119045
09/30/08 09:12 AM
09/30/08 09:12 AM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
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U.S.S.A.
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Quote:
Finally got a chance to pull my third member out. The pinion bearing looks OK, but the inside edges of the ring gear almost look like they have blued, The edges are also slightly rounded.
Does that sound like the result of taking the yoke off without installing a new sleeve?
Also, by my poor description of the above, will the gears live, howl, etc?
Thanks
How did you check the pinion bearings ? Did you disassemble the chuck ??
But I agree your pattern is WAY off from the sounds of the ends bluing , did you run a pattern check when you pulled it out ?
Will it still howl , how long have you run it like this ?
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Re: Differential howl
[Re: JohnRR]
#119046
09/30/08 11:16 AM
09/30/08 11:16 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
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[quote
Will it still howl , how long have you run it like this ?
About 100 miles.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: Differential howl
[Re: Gas_Bandit]
#119047
09/30/08 11:23 AM
09/30/08 11:23 AM
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Joined: Jan 2003
Posts: 8,180
Detroit, MI
CokeBottleKid
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Detroit, MI
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Quote:
I bought a rear from someone once that had 4.56s in it (8 3/4) and it had the most horrible howl ever. Same thing, edges of the ring gear teeth were rounding off. This tells you your pattern is WAAAAAY off. If you run gears for any length of time with the pattern not set up right, you are never going to get the gears to set up and run quiet again. There is no way you are going to get gears grinding on the edges of each other quiet again. New gears time.
if they didn't whine before you probably didn't torque the pinion correctly  .
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