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What gear ratio is this

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Old 09-17-2007, 12:57 PM
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Default What gear ratio is this
Car has a TH-400, 28" tall tire, at 60mph it is at about 2700 RPM.

I know there are calculators for it but I can't find the good one.

FIRST GEAR SECOND GEAR THIRD GEAR
2.48:1 1.48:1 1:1
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Old 09-17-2007, 01:11 PM
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3.42 gears come out to 2601 rpm.
This is assuming your vehicle mph is correct, you can't go off the speedo if your set up is not calibrated for the rear gear.
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Old 09-18-2007, 12:09 PM
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Forgot about that and tire size.

Ill just pull the cover off this winter. Stall could be effecting it also.
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Old 09-19-2007, 10:46 AM
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just put the car on jack stand and rotate the wheel 360 degrees. Count how many times the driveshafts spins. If it spins 4.1 times = 4:10 gears get it ?
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Old 09-19-2007, 05:37 PM
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Yeah Ill try that.
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Old 10-17-2007, 01:40 PM
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Looks like its going to be a 3.73 guys.
Also looks like first and second have been re-geared.

Shifting at 7k I am doing like 70mph going into second..........
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