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Transmissions and Drivetrain Need help with your trans? Problems with your axle?

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Old 08-24-2009, 01:13 AM   #1
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Join Date: Jul 2009
Location: Utah
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Car: 1982 indy 500 pace car
Engine: 400 small block of doom
Transmission: The stock 4 speed
Axle/Gears: Stock axle and gears

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3.18's?
Is this a real gear ratio? I counted it once then my dad counted it once(ring teeth and pinion teeth) and thats the ratio we came up with. Then when I came home to search for gears it says they do not exsist? So two people counted wrong im assuming? Or do I have a magic indy 500 racing rear end? ha. Mostly I just want to know so I can order 3.73 or 4.10s.
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Old 08-24-2009, 02:03 AM   #2
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Location: Bertram (outside Austin), TX
Posts: 12,214
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi

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Re: 3.18's?
There is a 3.08, but not a 3.18. Math wrong?

Easiest way to find the ratio, is to dimply jack the rear end off the ground. Pop the tranny in Neutral & spin a tire, while counting how many times the pinion yoke rotates.

2 3/4 turns = 2.73/2.77.....
3 turns = 3.08.....
3 1/4 turn = 3.23/3.27.....
3 1/2 turns = 3.42.....
3 3/4 turns = 3.73
etc...
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Old 08-24-2009, 08:04 AM   #3
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Re: 3.18's?
I've never seen a 3.18.
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Old 08-24-2009, 08:04 AM
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