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Old 04-23-2013, 09:34 AM
67rstbkt 67rstbkt is offline
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Default Opinion on rear end ratio choice

Hey guys, looking for an opinion on selecting a rear gear ratio. I have a Ford 9 inch with a Dodge Viper T-56 in my 67 Firebird. The motor is a stroked Pontiac (461) with Edelbrock heads.

Transmission ratios in my T-56 should be:
2.66; 1.78; 1.30; 1.0; .74; .50

I'll be using a 285/40/18 rear tire, so about 27"

I ran 4.11 through an online calculator and got the following:



mph/rpm 1000 2000 3000 4000 5000 6000
1st 7.3 14.7 22 29.4 36.7 44
2nd 11 21.9 32.9 43.9 54.9 65.8
3rd 15 30 45.1 60.1 75.1 90.1
4th 19.5 39.1 58.6 78.1 97.6 117.2
5th 26.4 52.8 79.2 105.5 131.9 158.3
6th 39.1 78.1 117.2 156.2 195.3 234.3


What do you guys think? Go with the 4.11 final ratio?
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Last edited by 67rstbkt; 04-23-2013 at 09:53 AM.
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