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Re: changed posi , now gears make lots of noise!
[Re: 69Cuda340S]
#296359
04/22/09 03:24 PM
04/22/09 03:24 PM
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Joined: Aug 2006
Posts: 1,349
warfordsburg, PA
dirt
OP
pro stock
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OP
pro stock
Joined: Aug 2006
Posts: 1,349
warfordsburg, PA
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It was 10 years ago and i am just now getting around to reusing it. i only put about 60 miles on it since the shop worked on it.
what would you torque the pinion bolt to?
I may have had him swap the yoke , that would be the only reason to mess with the pinion nut.
I should be able to torque the pinion nut down and set the lash and it should be good i would think,I remember him telling me he had to change the carrier bearings when he installed the other posi unit. but they were supposed to have been new.
what would you set the lash at for used 3.91 gears?
Last edited by dirt; 04/22/09 03:28 PM.
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Re: changed posi , now gears make lots of noise!
[Re: polkat]
#296363
04/22/09 04:13 PM
04/22/09 04:13 PM
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Joined: Jul 2004
Posts: 1,101
Retired now in Tennessee
Chi_Town_Runner
super stock
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super stock
Joined: Jul 2004
Posts: 1,101
Retired now in Tennessee
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It all depends on the case.
First, only the 489 case used the crush sleeve. The 741 and 742 cases used shim packs to set the pinion depth. On the 741 and 742 case (thanks to Dr. Diff), the pinion nut should be torqued to 140 ftlbs on a 10 spline and 280 ftlbs on a 23 spline.
There should be no play on the pinion. Take it out before you drive it any further and take it back to the guy who built it. The growl you hear could be the rear end eating itself up.
Good Luck,
Frank
Last edited by Chi_Town_Runner; 04/22/09 04:15 PM.
Remember - 2 wrongs don't make a right - but 3 rights make a left!
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Re: changed posi , now gears make lots of noise!
[Re: 68Bullit]
#296365
04/22/09 04:38 PM
04/22/09 04:38 PM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Quote:
Man I sold a 741 case 3.91 posi that howled pretty bad. It was a good unit as far as I know, and never put any metal in the gear oil, nor did it have any sharp teeth (and I put WELL over 2000 miles on it). I've heard of many of these same cases with the 3.91 gearset that many people say were fine but just howled and were very loud. It's interesting that it didn't start until you removed the old posi for a good working one.  FWIW, I'd say the guy set it up correctly 
I have 3.91's in my dart , factory gear set,they do not howl , even with the metal particle laced oil because of the POS cone type sure grip .
Did you read all he posted , the pinion is LOOSE , how can you think it's set up correctly if the pinion is loose ?
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Re: changed posi , now gears make lots of noise!
[Re: JohnRR]
#296367
04/22/09 05:25 PM
04/22/09 05:25 PM
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Joined: Mar 2008
Posts: 571
Western NC
68Bullit
mopar
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mopar
Joined: Mar 2008
Posts: 571
Western NC
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Quote:
Quote:
Man I sold a 741 case 3.91 posi that howled pretty bad. It was a good unit as far as I know, and never put any metal in the gear oil, nor did it have any sharp teeth (and I put WELL over 2000 miles on it). I've heard of many of these same cases with the 3.91 gearset that many people say were fine but just howled and were very loud. It's interesting that it didn't start until you removed the old posi for a good working one. FWIW, I'd say the guy set it up correctly
I have 3.91's in my dart , factory gear set,they do not howl , even with the metal particle laced oil because of the POS cone type sure grip .
Did you read all he posted , the pinion is LOOSE , how can you think it's set up correctly if the pinion is loose ?
"Seems" loose, and "some play" are references that the OP used IIRC.
Yeah, I did read all that he posted, and if you would read all of the entire thread you would see that there is uncertainty whether or not the yoke was even removed or not. The problem started after a working posi was installed, NOT before. No, it doesn't sound right that the yoke is loose, obviously. So, why have other units that were setup entirely correctly howled and made noises similar to what the OP described? That was merely what I was trying to point out.
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Re: changed posi , now gears make lots of noise!
[Re: stumpy]
#296368
04/22/09 07:04 PM
04/22/09 07:04 PM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
master
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master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
Just to clear up the terms a little. Chrysler uses the name suregrip. GM is a posi. Some folks get upset when you use a chevy name for a Mopar rearend. 
  In 1966 Dodge called the clutch type LS in my 66 Coronet a "Power Lock" 
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Re: changed posi , now gears make lots of noise!
[Re: JohnRR]
#296369
04/22/09 07:20 PM
04/22/09 07:20 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
Quote:
Man I sold a 741 case 3.91 posi that howled pretty bad. It was a good unit as far as I know, and never put any metal in the gear oil, nor did it have any sharp teeth (and I put WELL over 2000 miles on it). I've heard of many of these same cases with the 3.91 gearset that many people say were fine but just howled and were very loud. It's interesting that it didn't start until you removed the old posi for a good working one. FWIW, I'd say the guy set it up correctly
I have 3.91's in my dart , factory gear set,they do not howl , even with the metal particle laced oil because of the POS cone type sure grip .
Did you read all he posted , the pinion is LOOSE , how can you think it's set up correctly if the pinion is loose ?
John I too read is post and the previous posts. That is why I made the far previous statement that there should have been no need to take out the pinion to install the sure grip (if it was or is indeed loose), also made the statement that something was misassembled if it was quiet before and not after, and to get it set up right before driving it and a new wear pattern is established and the noise is irreversable. Again I repeat - But that being that these were quiet they need attention. ASAP. 
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Re: changed posi , now gears make lots of noise!
[Re: MoparforLife]
#296370
04/22/09 09:40 PM
04/22/09 09:40 PM
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Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
dave571
master
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master
Joined: Dec 2003
Posts: 5,314
Carstairs, Alberta, Canada
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OK Unless the bearings have failed, there wasn't enough preload when they changed the yolk(if that was done. The original poster isn't sure) Remove shims( a little at a time) from behind the outer pinion bearing, and retorque the nut until it has preload again. Drive it, and see if the noise is gone. Hopefully it is. If the noise is stil present, it may already be beyond help. The proper way to install a sure grip carrier on a used set of gears, is ... 1)Measure AND RECORD the backlash setting 2)remove the carrier assembly with the ring gear on it. 3)transfer ring gear to sure grip carrier 4)install new sure grip and gear into center chunk 5)use the adjusters to get the backlash EXACTLY the same as was. If it's not, the pattern is now off, and it will be noisy. By not changing pinion depth, and putting the backlash where it was, the original pattern is still intact. If this procedure wasn't followed, Setting it up, may help, but a worn gear set needs to maintain it's existing pattern to not be noisy. A new pattern means noise. Pinion depth, should not have been messed with. If the guy who changed the yolk decided to change the depth, and set the pattern up fresh from what it was, it is screwwed, and will always be noisy
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Re: changed posi , now gears make lots of noise!
[Re: dave571]
#296371
04/22/09 10:40 PM
04/22/09 10:40 PM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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 with stumpy right there is your prob you gots a posi were a suregrip should be and its making noise now sorry,I could not help not saying it  give doctordiff a call he will fix it
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Re: changed posi , now gears make lots of noise!
[Re: scratchnfotraction]
#296372
04/22/09 11:32 PM
04/22/09 11:32 PM
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Joined: Sep 2005
Posts: 364
Arkansas
kzcountry
enthusiast
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enthusiast
Joined: Sep 2005
Posts: 364
Arkansas
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Quote:
with stumpy
right there is your prob
you gots a posi were a suregrip should be and its making noise now
sorry,I could not help not saying it
give doctordiff a call he will fix it
I agree give Doctordiff a call. He will make it right. I just got my 489 case back yesterday, it had a howl and now quiet as can be. 
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Re: changed posi , now gears make lots of noise!
[Re: DoctorDiff]
#296376
04/23/09 10:33 AM
04/23/09 10:33 AM
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Joined: Jan 2003
Posts: 3,980
30 Rock
JS29
master
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master
Joined: Jan 2003
Posts: 3,980
30 Rock
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 Mona Lisa Vito: The car that made these two, equal-length tire marks had positraction. You can't make those marks without positraction, which was not available on the '64 Buick Skylark! Vinny Gambini: And why not? What is positraction? Mona Lisa Vito: It's a limited slip differential which distributes power equally to both the right and left tires. The '64 Skylark had a regular differential, which, anyone who's been stuck in the mud in Alabama knows, you step on the gas, one tire spins, the other tire does nothing. [the jury members nod, with murmurs of "yes," "that's right," etc] Vinny Gambini: Is that it? Mona Lisa Vito: No, there's more! You see? When the left tire mark goes up on the curb and the right tire mark stays flat and even? Well, the '64 Skylark had a solid rear axle, so when the left tire would go up on the curb, the right tire would tilt out and ride along its edge. But that didn't happen here. The tire mark stayed flat and even. This car had an independent rear suspension. Now, in the '60's, there were only two other cars made in America that had positraction, and independent rear suspension, and enough power to make these marks. One was the Corvette, which could never be confused with the Buick Skylark. The other had the same body length, height, width, weight, wheel base, and wheel track as the '64 Skylark, and that was the 1963 Pontiac Tempest. Vinny Gambini: And because both cars were made by GM, were both cars available in metallic mint green paint? Mona Lisa Vito: They were! Vinny Gambini: Thank you, Ms. Vito. No more questions. Thank you very, very much. [kissing her hands] Vinny Gambini: You've been a lovely, lovely witness.
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Re: changed posi , now gears make lots of noise!
[Re: plumebody]
#296378
04/23/09 01:52 PM
04/23/09 01:52 PM
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Joined: Feb 2005
Posts: 3,958
SW Fla.
CYACOP
master
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master
Joined: Feb 2005
Posts: 3,958
SW Fla.
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Quote:
My Cousin Vinnie
And she's HOT
Pic?
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