Barracuda Challenger Forum

Author Topic: What gears are you running?  (Read 2758 times)

Offline MoparDealer1971

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What gears are you running?
« on: July 09, 2012 - 05:32:31 PM »
Just wondering what gears you guys are running in your old mopar?  I have 3.23's in my 8 3/4....and it kills me on the highway.  Tachs 3200 RPM at 70 MPH.  I'm thinking about going back to 2.76!
1971 Dodge Challenger - 2010 Plum Crazy Pearl, 318 4-bbl, 904, 2.5in Pypes Performance X-pipe exhaust, Hemi torsion bars, 2in rear drop springs, Hellwig Motorsports sway bars, 11.75in Drilled/Slotted front brakes

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What gears are you running?
« on: July 09, 2012 - 05:32:31 PM »



Offline MEK-Dangerfield

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Re: What gears are you running?
« Reply #1 on: July 09, 2012 - 05:47:00 PM »
It depends on tire size too. I have 3:23's and I'm at 3000 RPM at 70 MPH. That was the way they rolled back then.

Mike

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Offline moparmaniac59

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Re: What gears are you running?
« Reply #2 on: July 09, 2012 - 06:34:59 PM »
I'm running a 3:91 posi with 295/50/15. Yes it sings at 60 mph. I simply turn up the radio.  :roflsmiley:


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Offline 72hemi

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Re: What gears are you running?
« Reply #3 on: July 09, 2012 - 06:36:28 PM »
Currently 3.23, but I am getting ready to swap them out with 3.91. I am running 255 60R 15 tires out back. Eventually I will be installing an overdrive, but for now I don't do much freeway driving so it's ok.
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Offline thedodgeboys

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Re: What gears are you running?
« Reply #4 on: July 09, 2012 - 09:06:22 PM »
4.10's in my 83/4 rear, 27 inch tall tires turning 1900 RPS at 70 MPH  :faint:



























































































































.05 6th gear  :cooldancing:
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Offline brads70

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Re: What gears are you running?
« Reply #5 on: July 09, 2012 - 09:21:14 PM »
3.55 but using the Keisler auto OD so it was 3000 @ 65 mph I expect it to be ( still have to install the new tranny) 2000 @ 65 mph
Brad
1970 Challenger 451stroker/4L60 auto OD
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Offline bigblue73

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Re: What gears are you running?
« Reply #6 on: July 20, 2012 - 08:13:40 PM »
3:55 with 285/40/17 tire (26.1 tall) 2050 RPM @ 70 MPH
TKO 600 - .64 overdrive.

Offline burdar

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Re: What gears are you running?
« Reply #7 on: July 20, 2012 - 08:51:33 PM »
Originally 2.76.  I had a good working 3.23 sure grip so that's what I put in.  We will see what the gas miliage is when I get it on the road.  I may have the 2.76's rebuilt.

Dad said when the car was new he could get 18-20mpg with it.  I'd be happy with that.

Offline LAA66

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Re: What gears are you running?
« Reply #8 on: July 20, 2012 - 09:45:34 PM »
 With extended highway use , 2.76 would be.... ok, 3.91 or even 4.10 in mountain areas are nice and close. I like 3.55 for all around though.
 
 And you OD guys really irritate me.  :crazy:

Offline Chryco Psycho

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Re: What gears are you running?
« Reply #9 on: July 21, 2012 - 09:38:47 AM »
I am running 3.73 but with the .71 OD 833

Offline 1970 RT Challenger 1970

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Re: What gears are you running?
« Reply #10 on: July 21, 2012 - 02:55:56 PM »
3.55

Offline TinCuda

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Re: What gears are you running?
« Reply #11 on: July 21, 2012 - 05:08:57 PM »
I like this web site for playing around with it...


http://vexer.com/automotive-tools/speed-rpm-calculator



.,
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Offline RCCDrew

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What gears are you running?
« Reply #12 on: July 21, 2012 - 07:04:53 PM »
4.10, but I am planning a 518 swap.

Offline Charles

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Re: What gears are you running?
« Reply #13 on: July 22, 2012 - 01:55:45 PM »
I like this web site for playing around with it...


http://vexer.com/automotive-tools/speed-rpm-calculator



.,

That's really cool, I had to play around a bit with it haha  :thumbsup:
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1970 'Cuda AAR - driving till the Chally gets back.


Offline 360FISH

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Re: What gears are you running?
« Reply #14 on: July 22, 2012 - 03:41:49 PM »
I'm running 3.73 with 275/60R15's...  wish I knew the rpms but my gauge doesn't work.   :hyper:

The A518 OD makes my 360 purr at 75 mph.    :woohoo:

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Re: What gears are you running?
« Reply #14 on: July 22, 2012 - 03:41:49 PM »