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Re: 3.91 or 4.30 gears for the street and track?
[Re: aarcuda]
#635958
03/11/10 02:56 PM
03/11/10 02:56 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
mopar
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mopar
Joined: Jun 2009
Posts: 644
Minnesota
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Don't care...tough to tell the diff...car is much more driveable on the hiway...I can still go rounds at 12.40.
The little old lady from Pasadena is back!
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Re: 3.91 or 4.30 gears for the street and track?
[Re: aarcuda]
#635959
03/11/10 06:14 PM
03/11/10 06:14 PM
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Joined: Jul 2003
Posts: 3,379
Rancho Cordova, CA
Exit1965
master
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master
Joined: Jul 2003
Posts: 3,379
Rancho Cordova, CA
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Quote:
Quote:
Surprised several years ago a buddy talked me into replacing my 3.91's with 3.23's. Ran 12.20's and 112 w/3.91's and 12.40's at 111 w/3.23's. Mileage went from 9 to 13 one the road, 65mph. Motor makes 511hp 580tq 500in...it doesn't care much for a deep gear. Torque motor.
you lost a 1/4 second with the gear change! thats a lot!!!!
1/5th the way I calculate it. For the mileage increase, and possibly feeling better when taking it on the freeway, not that bad of a sacrifice..
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Re: 3.91 or 4.30 gears for the street and track?
[Re: 67dodge67]
#635960
03/11/10 08:35 PM
03/11/10 08:35 PM
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Joined: Jul 2008
Posts: 30,632
Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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A diff spin on all this ..... Big torque motor .. not a super heavy-weight car ...... and a real "streeter" ? ... ....GO WITH the shortest gear possible ... ie 2.76. Your short-times(60 foot) will suffer a TAD but you will LOVE the driveability on the highway. HOW would you like to  a ZR1 Corvette from a 100-roll ? ..  
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Re: 3.91 or 4.30 gears for the street and track?
[Re: IcorkSOAK]
#635961
03/11/10 09:17 PM
03/11/10 09:17 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
mopar
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mopar
Joined: Jun 2009
Posts: 644
Minnesota
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We don't have and 2.76 pumpkins around, but I'd try one if we did. purpose built torque motor for the street...give me 400 less rpms at 60 and maybe I can get 16mpg and now run 12.60's.
The little old lady from Pasadena is back!
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Re: 3.91 or 4.30 gears for the street and track?
[Re: Barnstorm]
#635962
03/11/10 09:34 PM
03/11/10 09:34 PM
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Joined: Jul 2008
Posts: 30,632
Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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Quote:
...give me 400 less rpms at 60 and maybe I can get 16mpg and now run 12.60's.
THERE ya go ... Now I have a lite-weight 62 Belvedere, just a basic-HP rebuild, iron manifolds ... 276 gear ..
and it should run 12.30's and get near 20 mpg(if not more).
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Re: 3.91 or 4.30 gears for the street and track?
[Re: IcorkSOAK]
#635963
03/11/10 10:05 PM
03/11/10 10:05 PM
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Joined: Jun 2009
Posts: 644
Minnesota
Barnstorm
mopar
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mopar
Joined: Jun 2009
Posts: 644
Minnesota
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Maybe Slantzilla has some thing that runs 12's and gets 30mpg.
The little old lady from Pasadena is back!
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Re: 3.91 or 4.30 gears for the street and track?
[Re: 67dodge67]
#635965
03/12/10 12:25 AM
03/12/10 12:25 AM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I gave up on deep gears years ago after putting 4.56 gears in a street car and hating them. Big surprise, went back to 3.23's and really didn't change e.t. at the strip! Deepest I'll go with a street car now is 3.55's. If I want better e.t.'s I'll throw a buttload of stall in the convertor at it. 
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Re: 3.91 or 4.30 gears for the street and track?
[Re: Barnstorm]
#635966
03/12/10 12:29 AM
03/12/10 12:29 AM
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Joined: Jul 2008
Posts: 30,632
Florida STAYcation
IcorkSOAK
Financed his waterbed
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Financed his waterbed
Joined: Jul 2008
Posts: 30,632
Florida STAYcation
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Quote:
Maybe Slantzilla has some thing that runs 12's and gets 30mpg.
Hey HAY ...was this a jab ? .... 
I had a junk-yard 440 in there ...and it ran 12.80's and got 17.
So THERE .... 
And slant ...with his 'Tona ....maybe could get 40.
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Re: 3.91 or 4.30 gears for the street and track?
[Re: Dougsmopars]
#635967
03/12/10 12:29 AM
03/12/10 12:29 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
master
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master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
3:Top speed on high way will be around 60 and taching around 3800 to 4000. I
Unless you have 24 inch tall tires your converter needs help........
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: 3.91 or 4.30 gears for the street and track?
#635968
03/12/10 12:33 AM
03/12/10 12:33 AM
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Joined: Aug 2005
Posts: 989
WI, USA
67dodge67
OP
mopar addict
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OP
mopar addict
Joined: Aug 2005
Posts: 989
WI, USA
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OK... so that leads to my next question then.... why would you overkill your converter if your powerband is between 2600 - 5800? I'm going by what I have experienced driving it on the track... not the true numbers. SOOOO my converter as of now is a PTC 11" and rated at 2800 which is AWESOME now. SOOOO would a 3000 or 3500 stall be that much better? That would be a 10" or a 9"? Sorry, converters are not my best subject (recap on my set up: 470, 727, 3.91, eddy rpm heads, rpm intake, 830 quick fuel, voodoo cam 513 intake, 533 ehxaust) I'm open to any and all suggestions. Thanks!
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