Re: New 3:55 gears always howl. True or False?
[Re: moper]
#1795058
04/04/15 11:11 AM
04/04/15 11:11 AM
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Joined: Feb 2005
Posts: 28,312 Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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Quote:
Any gear can be noisey if there's a problem. Problems are not always with the gears themselves, or even from the chuck. But - if there are not other issues, and they are broken in proerly, no gear ratio in and of itself will be noisey.
The wrong pinon angle can cause a perfectly setup rear to howl.
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Re: New 3:55 gears always howl. True or False?
[Re: TJP]
#1795059
04/04/15 04:25 PM
04/04/15 04:25 PM
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Joined: Jan 2005
Posts: 12,478 Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,478
Kalispell Mt.
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That's BS. The gears aren't set up properly. He's blowing smoke at you. Need to find someone else that knows what they're doing, and talking about. When i first started out as an auto mechanic, i worked at a shop doing differentials, here in my city.
The other common Fallacy is that the lower you go the more they will whine, BULLS$heet I say. I have run gear sets as low as 5:13's in a street car that were quiet as a church mouse. I've run 3:91's, 4:10's, 4:30's, 4:56's, 4:88's and 5:13's. ALL QUIET noise wise WHEN SET UP PROPERLY. IF one is talking about special RACE only sets that could be a different story.
And it is the same guys that can't get the gears to be quiet that can't get a 8.75 to last behind a slant 6. IT IS ALL IN THE SET UP!!!! Some guys break them time after time after time and say the rear is junk, then other guys set them up and they last for really long times. I am shocked at how many shops I have seen guy replace a pinion seal on a crush sleave rear and just tighten the nut with a big ole impact, there are not a lot of guys who reeeeeealy understand how to set up a hypoid gear.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: New 3:55 gears always howl. True or False?
[Re: HotRodDave]
#1795060
04/04/15 05:47 PM
04/04/15 05:47 PM
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Joined: Jan 2011
Posts: 4,785 Utah and Alaska
astjp2
master
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master
Joined: Jan 2011
Posts: 4,785
Utah and Alaska
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That's BS. The gears aren't set up properly. He's blowing smoke at you. Need to find someone else that knows what they're doing, and talking about. When i first started out as an auto mechanic, i worked at a shop doing differentials, here in my city.
The other common Fallacy is that the lower you go the more they will whine, BULLS$heet I say. I have run gear sets as low as 5:13's in a street car that were quiet as a church mouse. I've run 3:91's, 4:10's, 4:30's, 4:56's, 4:88's and 5:13's. ALL QUIET noise wise WHEN SET UP PROPERLY. IF one is talking about special RACE only sets that could be a different story.
And it is the same guys that can't get the gears to be quiet that can't get a 8.75 to last behind a slant 6. IT IS ALL IN THE SET UP!!!! Some guys break them time after time after time and say the rear is junk, then other guys set them up and they last for really long times. I am shocked at how many shops I have seen guy replace a pinion seal on a crush sleave rear and just tighten the nut with a big ole impact, there are not a lot of guys who reeeeeealy understand how to set up a hypoid gear.
You mean torque wrenches are not optional?
1941 Taylorcraft 1968 Charger 1994 Wrangler 1998 Wrangler 2008 Kia Rio 2017 Jetta
I didn't do 4 years and 9 months of Graduate School to be called Mister!
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Re: New 3:55 gears always howl. True or False?
[Re: astjp2]
#1795061
04/04/15 11:11 PM
04/04/15 11:11 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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I read in Mopar Action magazine that the Mopar engineers chose their ratios based on several factors. One was in relation to the amount of times the pinion gear intersected the same teeth on the ring gear. Please forgive my vague description here, but the theory was that the fewer times the same teeth touched each other, the longer lasting the gearset was by spreading out the wear and the load. This explains why the Mopars came with some ratios different than GM or Ford. Numbers like 2.71, 2.76, 2.93, 2.94, 3.91 were rarely seen outside of the Mopar brand. the 3.23 and 3.55 were more common ratios though. GM used them as well as some GM specific #s like 3.07, 3.08, 3.42 and 3.73.
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Re: New 3:55 gears always howl. True or False?
[Re: DaveRS23]
#1795062
04/04/15 11:51 PM
04/04/15 11:51 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
There are particular gear sets than will be noisy, no matter the set-up. But that is more brand or batch specific, than ratio specific.
I agree with this. Most gears will not make much noise if set-up right. But I have seen some that make noise (not alot of noise but some) and they were done by good shops. Working for a Dodge dealer I can tell you I remember a truck that a customer complained the rear was noisey. It was a brand new truck with the new to Dodge "American Rear" and this was around 2005 to 2008 as I dont remember which year. I ended up replacing the ring and pinion and the pinion and carrier bearings as per the Mopar tech adviser and it was no different when I was done. And we had the proper tools for it since we were a Dodge dealer. It was not alot of noise as it was a small whine at about 55 mph. In fact most people would not even complain but this guy must have drove this speed alot. So in the long run Mopar had me replace the full drum to drum rear and recheck all the settings including pinion angle which made no difference as it still had some noise. I do believe the whine noise in the complete new unit did happen at a slightly lower speed. In the end the custumer was told that small whine is normal as it was and as I said most people like you all and me would have never even thought it was noisey enough to complain about. The guy took the truck happy with us as he saw me replacing the complete unit because the service manager brought him in the shop so he could see for himself we replaced the drum to drum unit. Ron
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Re: New 3:55 gears always howl. True or False?
[Re: RapidRobert]
#1795069
04/06/15 01:18 AM
04/06/15 01:18 AM
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Joined: Jun 2006
Posts: 5,173 CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,173
CT
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I set up the Richmond 4.56s in my 8 3/4. Good pattern, took it for a short ride, let it cool 3 times. It said break them in 500 miles, I thought yeah ok, I can't resist that long. Plus drag cars don't do it, right? (They also don't drive on the street) Layed into it 3rd gear from 30 mph and it got sideways hard. Gotta do it again. And again. And then it got noisy. They hum on the highway now, guess I'll be a good boy next time
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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