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Old 12-08-2002, 07:24 PM
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Post a faster et 1/4 mile time

what gear in the rearend should i use to get the fastest 1/4 mile time with a 72' mach 1, with a 351c 4v, 3-speed auto. i dont waana go to fast on the street becaus that is risky but i do wanna be able to race and beat a honda or any other
"rice rocket"

[ December 08, 2002: Message edited by: jboxcar818 ]</p>

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Old 12-08-2002, 07:59 PM
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3.55 all day long will still be able to go on the highway and still spank those pesky four cylinders will go well over a hundred at rpm though probably 4500 rpm depending on tire size maby faster 2.73 gear @ 4500rpm with a 29 inch tire comes out to 145mph a little to fast for the street and kills acceleration in a heavy vehical if you have a 2 something gear you will see a huge difference in acceleration and traction LOSS!!!!!! make sure you have the rubber to back it up
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Old 12-08-2002, 08:01 PM
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that is if you change from a 2 something gear to a 3.55 or better, acceleration will improve greatly while still keeping the water from boiling say bye bye tires
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Old 12-09-2002, 04:25 PM
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I've got 3.70's in my '73 and love 'em. Like stated, you can forget about flying down any interstates with 'em. I, for the most part, have left my speeding down the highway days behind (gets too costly). Now I mostly enjoy hopping from light to light and cruisin' down back roads. If I want to go 80mph down the highway I'll do it in my daily driver that doesn't stand out like a soar thumb to any cop on the road. I have a 302 in my '73 and she launches like a bear with the 3.70 posi.
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Old 12-09-2002, 07:05 PM
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Like I said, try these guys. They helped me

www.pchotrod.com
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Old 12-09-2002, 07:25 PM
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Do you want to race honda's and NOT go fast on the street? where you gonna race them?
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Old 12-09-2002, 08:16 PM
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what i meant to say was i want to go fast but not out of control fast (like 120) but i wanna be able to jump at a stop light to beat a honda to the next stplight
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Old 12-10-2002, 07:21 AM
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That is a complex answer. You want the engine to be at maximum HP when you cross the line. This means you must know the power range and level of your engine, hieght of the tires, torque converter slippage and the approximate speed the car will run in the 1/4 mile.

One could make a wild *** guess and say for a mild street engine that will turn 5000 RPM and run 28 inch tires a set of 4:10 gears would be good. BUT, that is just a wild *** guess if you dont know everything about your combination.

Chris
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