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07-04-2007, 09:41 PM
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#1 |
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Registered User
Join Date: May 2007
Location: Erie pa.
Posts: 57
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whats the gear ratio?
I have a 77 3/4 ton 4x4 with a open rear end, whats the best way to figure out the gear ratio. thanks
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65 tripower conv 4spd gto, 66gto, 67 gto 65 lemans conv 4spd 69 firebird conv. 67 c20 4x4 Last edited by goldengoat2; 07-04-2007 at 09:53 PM. |
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07-04-2007, 10:32 PM
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#2 |
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Registered User
Join Date: Dec 2003
Location: Stockton, CA
Posts: 1,579
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Re: whats the gear ratio?
The only way to know for sure is remove cover and count the ring gear teeth and then the pinion gear teeth and divide.
You can lift the rear and turn the tire one revelution and count the number of turns of the driveline but not always accurate that way.
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For every person with a spark of genius, There are a hundred with ignition trouble.  70 Short/Step
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07-04-2007, 10:37 PM
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#3 |
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Registered User
Join Date: Mar 2006
Location: USA
Posts: 21,019
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Re: whats the gear ratio?
Or get the numbers off the ring gear and use this chart:
That's alot easier than counting teeth... Ratio 2.56:1 - Tooth Combination 41,16 Ratio 2.73:1 - Tooth Combination 41,15 Ratio 3.07:1 - Tooth Combination 43,14 Ratio 3.08:1 - Tooth Combination 40,13 Ratio 3.08:1 - Tooth Combination 37,12 Ratio 3.31:1 - Tooth Combination 43,13 Ratio 3.36:1 - Tooth Combination 37,11 Ratio 3.42:1 - Tooth Combination 41,12 Ratio 3.55:1 - Tooth Combination 39,11 Ratio 3.73:1 - Tooth Combination 41,11 Ratio 4.10:1 - Tooth Combination 41,10 Ratio 4.11:1 - Tooth Combination 37,9 |
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07-04-2007, 10:43 PM
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#4 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Re: whats the gear ratio?
Lift ONE tire only, then count driveshaft revolutions during TWO full rotations of the tire.
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07-04-2007, 10:45 PM
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#5 |
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Designated A-hole!
Join Date: Mar 2003
Location: South Mississippi
Posts: 36,448
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Re: whats the gear ratio?
 That's how I figured out what I had.
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"If it ain't broke, fix it 'til it is!" Being stupid ain't illegal.  We're Still Debt Free Except for the House!!! www.daveramsey.com 70 GMC SWB Stepside project "Green Booger" soon to be 6.0l/4l80e 93 S-10 "Poppaw's Truck" |
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07-05-2007, 07:34 AM
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#6 |
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Registered User
Join Date: May 2007
Location: Erie pa.
Posts: 57
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Re: whats the gear ratio?
Thanks everyone
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65 tripower conv 4spd gto, 66gto, 67 gto 65 lemans conv 4spd 69 firebird conv. 67 c20 4x4 |
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