what rear end gears to use with a 727?

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Old May 28, 2014 | 01:24 PM
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what rear end gears to use with a 727?

Me and my G-Pa just got done rebuilding the engine in our '74 charger. 318 30'd over with a edelbrock 600 cfm and cam (not sure on the cam specs, was never told what they were by the people who built it ) we also rebuilt the 727 and threw a shift kit in it, original torque converter. The car however, is still doing a 0-60 slower than a prius (9 sec.). Is this more likely to be short rear end gears or timing? wouldnt mind replacing the gears anyway because it still dont have a locking diff
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Old May 28, 2014 | 02:24 PM
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3.23 is a great street gear, I wouldn't go more than 3.55.

Getting a timing light on it to determine initial, total and at what rpm is key to getting the best performance, not knowing could hurt.
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Old May 28, 2014 | 03:25 PM
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bjm -

Originally Posted by Coronet 500
3.23 is a great street gear, I wouldn't go more than 3.55.

Getting a timing light on it to determine initial, total and at what rpm is key to getting the best performance, not knowing could hurt.
Yup.

Only thing you would have to consider is what you want to do with the car.
If stop light to stop light is your thing, you can certainly go with higher numbers. (Remember, it's a 4K pound car...)
If you plan on driving it on the highway, the definitely want something in the 3.23 - 3.55 range.

BTW - before I dropped in the 440, my 74 Charger had a moderately modified 318, the 3.23s really were the right gears (still are).

Archer

Last edited by Archer; May 28, 2014 at 03:29 PM.
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Old May 28, 2014 | 03:32 PM
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300 Shot of NOS will fix that.....
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Old May 28, 2014 | 04:22 PM
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Originally Posted by RacerHog
300 Shot of NOS will fix that.....
Ha Ha.. I would put 3.55 gears in it.. IF it is a daily driver 3.23
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Old May 28, 2014 | 06:31 PM
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I don't know what you EXPECT

A charger is a fairly heavy car

Using the stock converter and an unknown bigger cam might be 90% of the problem

And, we don't have any idea what you've done to optimize carb and timing, IE tuning

I found one website that showed a stock 318 73 Dart Sport at 8.8, so "whaddaya 'spect" in a car that weighs at least another 600 lbs or so

Also, what intake are you using? Exhaust? There are so many variables here it's just incredible.

Last edited by 440roadrunner; May 28, 2014 at 06:43 PM.
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Old May 29, 2014 | 12:07 AM
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I wouldn't call it a daily driver but I do want it to be Highway drivable. Running a 360 intake, stock headers, and true dual exhaust with race mufflers. I don't expect unholy 0-60 times, but just enough to make it a more fun car to drive (fun for me being the car just about scaring the daylight outta me to goose it). I was considering a gear vendors unit in the future along with a cam I know the specs of also. As far as carb tuning I'm in Wyoming elev. 4500 ft. And running whatever edelbrock specs for that altitude is (they have a setup for exactly 4500 ft.)
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Old May 29, 2014 | 08:59 AM
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As long as it's not a daily driver...... I like the 3.73 or 3.91 for the big car... That will Spice it up a bit....

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Old May 29, 2014 | 12:24 PM
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Any cam recommendations?
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Old May 29, 2014 | 02:55 PM
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IF you have the ingredient's....
http://www.lunatipower.com/Product.aspx?id=2344&gid=287

If more on the stock side.....
http://www.lunatipower.com/Product.aspx?id=2342&gid=287

If that carb dont work out..... Get a Holley From Jesse At Bigs Performance...
http://www.bigsperformance.com/

Just my 2 cents...
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Old May 29, 2014 | 05:29 PM
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I have some ideas on cams but I must ask if you are willing to change springs, remove heads for a little work maybe even cut down the guides for safe lift.
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