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3.91 or 4.30 gears for the street and track? #635936 03/10/10 06:59 PM 03/10/10 06:59 PM
Joined: Aug 2005 Posts: 989 WI, USA 6 67dodge67 OP mopar addict
67dodge67 OP mopar addict 6 Joined: Aug 2005 Posts: 989 WI, USA	I've got a simple question here. 67 Coronet, 470, 727, 11" PTC converter, 28" tire. Which gears would you choose? 3.91 or 4.30? It will see both street and strip. Opinions? Thanks for your help.

Re: 3.91 or 4.30 gears for the street and track? [Re: 67dodge67] #635937 03/10/10 07:00 PM 03/10/10 07:00 PM
Joined: Nov 2003 Posts: 3,106 Ridgeland Wi M mopars_1 master
mopars_1 master M Joined: Nov 2003 Posts: 3,106 Ridgeland Wi	3.91's would be my choice 1971 Plymouth Duster 340 auto 1937 Plymouth PT50 1969 Dodge Dart Swinger 340 4 speed 2013 Ram laramie 2500 hemi 2008 Harley FLSTSB springer

Re: 3.91 or 4.30 gears for the street and track? [Re: 67dodge67] #635938 03/10/10 07:01 PM 03/10/10 07:01 PM
Joined: Feb 2003 Posts: 21,318 Manitoba, Canada DaytonaTurbo Too Many Posts
DaytonaTurbo Too Many Posts Joined: Feb 2003 Posts: 21,318 Manitoba, Canada	With 4.30's and a 28" tire, you may run out of rpm before the end fo the 1/4 mile. And niether one of those gears will be the greatest on the highway but you can play with this calculator: http://vexer.com/68rt/speed.html

Re: 3.91 or 4.30 gears for the street and track? [Re: mopars_1] #635939 03/10/10 07:04 PM 03/10/10 07:04 PM
Joined: Jan 2010 Posts: 236 upstate, New York jvcuda enthusiast
jvcuda enthusiast Joined: Jan 2010 Posts: 236 upstate, New York	Have a 3.91 in my '73 cuda,440,727,28" tire

Re: 3.91 or 4.30 gears for the street and track? [Re: DaytonaTurbo] #635940 03/10/10 07:05 PM 03/10/10 07:05 PM
Joined: May 2005 Posts: 2,295 dark side of the moon D Dougsmopars top fuel
Dougsmopars top fuel D Joined: May 2005 Posts: 2,295 dark side of the moon	3:91's. There not that bad on highway. 4:30's are way to much. Top speed on high way will be around 60 and taching around 3800 to 4000. I had 4:57's with a 4 speed. It was fun around town but forget the high way a prius will blow your doors off on the freeway. lol

Re: 3.91 or 4.30 gears for the street and track? [Re: Dougsmopars] #635941 03/10/10 07:11 PM 03/10/10 07:11 PM
Joined: May 2007 Posts: 209 New Zealand S solidcam enthusiast
solidcam enthusiast S Joined: May 2007 Posts: 209 New Zealand

Re: 3.91 or 4.30 gears for the street and track? [Re: Dougsmopars] #635942 03/10/10 07:14 PM 03/10/10 07:14 PM
Joined: Jan 2003 Posts: 6,497 N.E. Ohio K KillerBee master
KillerBee master K Joined: Jan 2003 Posts: 6,497 N.E. Ohio	Between the 3.91 and the 4.30 I would pick the 3.91's unless you want evey tenth in the 1/4 but the 4.30 gear might be too much gear with a 28" tire. If I had my choice I would go with 4.10, that's what I have in my Challenger with 28" tall tires. 5856898-launch.jpg (126 downloads)

Re: 3.91 or 4.30 gears for the street and track? [Re: KillerBee] #635943 03/10/10 07:23 PM 03/10/10 07:23 PM
Joined: Aug 2005 Posts: 989 WI, USA 6 67dodge67 OP mopar addict
67dodge67 OP mopar addict 6 Joined: Aug 2005 Posts: 989 WI, USA	Ok. So far it seems 3.91's are the better bet here. Thanks for the input! By the way, nice Challenger!

Re: 3.91 or 4.30 gears for the street and track? [Re: 67dodge67] #635944 03/10/10 08:41 PM 03/10/10 08:41 PM
Joined: Oct 2005 Posts: 4,941 WI Dcuda69 master
Dcuda69 master Joined: Oct 2005 Posts: 4,941 WI	I did a 3.73 w/a 470" and a 4 spd in my 69 B'cuda w/a 26" tire. With your 28" tire I think the 3.91's will be a good fit for street/strip!!

Re: 3.91 or 4.30 gears for the street and track? [Re: Dcuda69] #635945 03/10/10 10:29 PM 03/10/10 10:29 PM
Joined: Mar 2003 Posts: 15,478 the boonies aarcuda I Live Here
aarcuda I Live Here Joined: Mar 2003 Posts: 15,478 the boonies	i have 4.30's wit ha 28" tire, 10" converter. i love it. around town its a blast. i drive 60 miles to the track but i keep it at 60 mph. 65 max. at 60 mph im revving around 3300 rpm, at 65 around 3500 rpms It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.

Re: 3.91 or 4.30 gears for the street and track? [Re: aarcuda] #635946 03/10/10 10:36 PM 03/10/10 10:36 PM
Joined: Aug 2005 Posts: 989 WI, USA 6 67dodge67 OP mopar addict
67dodge67 OP mopar addict 6 Joined: Aug 2005 Posts: 989 WI, USA	Quote: i have 4.30's wit ha 28" tire, 10" converter. i love it. around town its a blast. i drive 60 miles to the track but i keep it at 60 mph. 65 max. at 60 mph im revving around 3300 rpm, at 65 around 3500 rpms Hmmm.... interesting.... I haven't committed to either gear set as of yet... a 10" converter makes a difference then... anyone else with a similar set up as well? Thanks! Last edited by 67dodge67; 03/10/10 10:38 PM.

Re: 3.91 or 4.30 gears for the street and track? [Re: 67dodge67] #635947 03/10/10 10:46 PM 03/10/10 10:46 PM
Joined: Mar 2005 Posts: 2,060 Pendleton NY T terzmo top fuel
terzmo top fuel T Joined: Mar 2005 Posts: 2,060 Pendleton NY	a 28 inch tire may rub the wheel well. I put 29's on mine and the fit but rubbed on a bump so out they came. I would say 27's would work and the 391's would be fine...430's may be too much for the motor...what HP ?

Re: 3.91 or 4.30 gears for the street and track? [Re: terzmo] #635948 03/10/10 10:57 PM 03/10/10 10:57 PM
Joined: Jan 2003 Posts: 1,180 Willoughby Hills, Ohio gd9704 super gas
gd9704 super gas Joined: Jan 2003 Posts: 1,180 Willoughby Hills, Ohio	I run 3.91s....I would consider them "max" if you're going to do any freeway driving....

Re: 3.91 or 4.30 gears for the street and track? [Re: gd9704] #635949 03/10/10 11:39 PM 03/10/10 11:39 PM
Joined: Jan 2008 Posts: 350 CT USA N Nick Mineau enthusiast
Nick Mineau enthusiast N Joined: Jan 2008 Posts: 350 CT USA	i vote 3.91 but 3.55 would be better if you plan on driving it a bunch. a 440 should have plentey of power even with 2.73"S LOL. you might loose .2 in the 1/4 but it will go down the road much better. it really sucks when your race car cant keep up with traffic

Re: 3.91 or 4.30 gears for the street and track? [Re: 67dodge67] #635950 03/11/10 08:46 AM 03/11/10 08:46 AM
Joined: Jan 2003 Posts: 1,009 Richmond Twp. Mi. Mr340 super stock
Mr340 super stock Joined: Jan 2003 Posts: 1,009 Richmond Twp. Mi.	Quote: Quote: i have 4.30's wit ha 28" tire, 10" converter. i love it. around town its a blast. i drive 60 miles to the track but i keep it at 60 mph. 65 max. at 60 mph im revving around 3300 rpm, at 65 around 3500 rpms Hmmm.... interesting.... I haven't committed to either gear set as of yet... a 10" converter makes a difference then... anyone else with a similar set up as well? Thanks! Same set up here but with a 340. I instaled a 416 last year and with the added torque I'm thinking of switching to a 3.91. How tight do you want to turn that 470? The 4.30 is fun stop lite to stop lite and if your not in hurry Ok on the freeway but I think the 3.91 will be more liveable.

Re: 3.91 or 4.30 gears for the street and track? [Re: jvcuda] #635951 03/11/10 11:48 AM 03/11/10 11:48 AM
Joined: Mar 2003 Posts: 3,358 Berwyn, IL challenger70 master
challenger70 master Joined: Mar 2003 Posts: 3,358 Berwyn, IL	Quote: Have a 3.91 in my '73 cuda,440,727,28" tire Same combo I have in my challenger, fun on the streets and ok on the highway below 70.

Re: 3.91 or 4.30 gears for the street and track? [Re: challenger70] #635952 03/11/10 12:35 PM 03/11/10 12:35 PM
Joined: Jul 2003 Posts: 4,765 Holland MI Ottawa 2 2boltmain master
2boltmain master 2 Joined: Jul 2003 Posts: 4,765 Holland MI Ottawa	I had a Challenger with 29" tall rears and 4:10s. I did not like to drive on the highway. Too many RPMs to go 60mph. Keep old mopars alive.

Re: 3.91 or 4.30 gears for the street and track? [Re: 2boltmain] #635953 03/11/10 01:04 PM 03/11/10 01:04 PM
Joined: Mar 2005 Posts: 2,060 Pendleton NY T terzmo top fuel
terzmo top fuel T Joined: Mar 2005 Posts: 2,060 Pendleton NY	I have 29 inch tires on My bee with a 4 speed and turn just a hair less than 65 at 3000 rpm. 440 and 410 dana The stock wheel well on 66 and 67 coronet and satellites don't accept a real big tire. I've seen 275 width the most with special offset wheels. BUT...try and fix a flat on the road with them. The wheel well on a 68 on up will accept much bigger tires/wheels.

Re: 3.91 or 4.30 gears for the street and track? [Re: terzmo] #635954 03/11/10 01:56 PM 03/11/10 01:56 PM
Joined: Jun 2009 Posts: 644 Minnesota Barnstorm mopar
Barnstorm mopar Joined: Jun 2009 Posts: 644 Minnesota	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. The little old lady from Pasadena is back!

Re: 3.91 or 4.30 gears for the street and track? [Re: terzmo] #635955 03/11/10 02:11 PM 03/11/10 02:11 PM
Joined: Aug 2005 Posts: 989 WI, USA 6 67dodge67 OP mopar addict
67dodge67 OP mopar addict 6 Joined: Aug 2005 Posts: 989 WI, USA	Quote: I have 29 inch tires on My bee with a 4 speed and turn just a hair less than 65 at 3000 rpm. 440 and 410 dana The stock wheel well on 66 and 67 coronet and satellites don't accept a real big tire. I've seen 275 width the most with special offset wheels. BUT...try and fix a flat on the road with them. The wheel well on a 68 on up will accept much bigger tires/wheels. Going with the 3.91's. I mini tubbed my car a while back so I have added room for tires. Before I did that, I was able to get 255x70x15's in it but wanted a wider tire so I now have 275x60x15 mt drag radials. Now I'm wondering which converter to use... I have an 11" now, but thinking a 10" or maybe a 9.5" would be better. Thanks again for all the input. Last edited by 67dodge67; 03/11/10 02:13 PM.

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