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New 3:55 gears always howl. True or False?
#1795037
04/02/15 04:34 PM
04/02/15 04:34 PM
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Joined: Oct 2009
Posts: 1,185
Nanaimo, BC
NOrrTH
OP
super stock
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OP
super stock
Joined: Oct 2009
Posts: 1,185
Nanaimo, BC
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I had a very respected Mopar guy who runs a tranny and rear end shop rebuild my 489 pig. He advised against the 3:55 gear because he said they don't cut the teeth the same way as they used to and they ALL howl now regardless of brand. It just affects the 3:55 gear set for some reason. He also said that if I was determined to go with the 3:55, the best thing to do was find NOS factory gears.
Anyway I went ahead and they do howl around freeway speeds. I thought I could live with it but the gear reminds me its there over and over again. So now I'm thinking of 3:73...
Anyone else heard of this?
'71 GTX N96 auto 3:55
'74 Challenger 440+6 4spd 4:10
'71 Duster 340 auto 4:10
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Re: New 3:55 gears always howl. True or False?
[Re: NOrrTH]
#1795038
04/02/15 04:50 PM
04/02/15 04:50 PM
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Joined: Jan 2003
Posts: 5,357
Rancho Cordova, California (Sa...
hemi71x
master
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master
Joined: Jan 2003
Posts: 5,357
Rancho Cordova, California (Sa...
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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.
RF-4C Phantom 69-370 Zweibrucken, Germany
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Re: New 3:55 gears always howl. True or False?
[Re: hemi71x]
#1795039
04/02/15 04:59 PM
04/02/15 04:59 PM
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Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
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Quote:
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.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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Re: New 3:55 gears always howl. True or False?
[Re: NOrrTH]
#1795043
04/03/15 12:59 AM
04/03/15 12:59 AM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I submit that they were a set that was setup wrong & howled for a prior owner & he is (now) attempting to pawn them off on you to cut his loss(es). EDIT Competent and crooked are two different attributes & they ain't mutually exclusive. The tip off (to me) on this deal was him blaming the numerical ratio choice as being the problem
Last edited by RapidRobert; 04/03/15 03:47 PM.
live every 24 hour block of time like it's your last day on earth
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Re: New 3:55 gears always howl. True or False?
[Re: hemi71x]
#1795045
04/03/15 01:09 AM
04/03/15 01:09 AM
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Joined: Nov 2004
Posts: 25,050
Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Quote:
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..
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Re: New 3:55 gears always howl. True or False?
[Re: TheTieWrapKid]
#1795050
04/03/15 01:47 PM
04/03/15 01:47 PM
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Joined: Feb 2003
Posts: 12,675
Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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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.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: New 3:55 gears always howl. True or False?
[Re: moper]
#1795051
04/03/15 02:30 PM
04/03/15 02:30 PM
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Joined: Dec 2010
Posts: 12,375
SoCal
MuuMuu101
I got lucky at Woodward!
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I got lucky at Woodward!
Joined: Dec 2010
Posts: 12,375
SoCal
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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.
This is what I was thinking. My friend who built my 489 case 3.55 gears is very picky about how it's set up. Even when I was putting my 8 3/4 together he didn't want me to consult anyone but him. He was extra particular about how the gears were broke in, especially with a 489 case that has a crush sleeve. IIRC he states 20 minutes of light street driving and 2 hours of rest to cool down for about 3 cycles, always use an 85w gear oil or higher, and no burnouts/towing for the first 500 miles.
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Re: New 3:55 gears always howl. True or False?
[Re: mopars4ever]
#1795054
04/03/15 07:50 PM
04/03/15 07:50 PM
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Joined: Oct 2009
Posts: 1,185
Nanaimo, BC
NOrrTH
OP
super stock
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OP
super stock
Joined: Oct 2009
Posts: 1,185
Nanaimo, BC
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I broke in my "new" set very easy. I don't want to mention any names, but this guy is very wealthy, has lived mopars since he was a kid, owns about 30 of them now, some of which are worth hundreds of thousands, drag races and is a bit of a Mopar celebrity in these parts...and he runs a transmission shop which has been doing rear ends for decades. My point is, he's not some Craigslist back yard mechanic, hack. Now I'm really scratching my head  
'71 GTX N96 auto 3:55
'74 Challenger 440+6 4spd 4:10
'71 Duster 340 auto 4:10
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Re: New 3:55 gears always howl. True or False?
[Re: an8sec70cuda]
#1795056
04/03/15 11:48 PM
04/03/15 11:48 PM
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Joined: Jan 2003
Posts: 15,293
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,293
Omaha Ne
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Quote:
Quote:
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.  
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