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01-04-2011, 01:34 PM
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#1 |
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Registered User
Join Date: Sep 2003
Location: Boise ID
Posts: 609
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Gear ratio
Someone on craigslist has a rear end for sale. How do I tell what the gear ratio is if there is no markings? How many turns of the axle compared to the shaft input? I am looking for 3.73's.
Gary
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"72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES" 
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01-04-2011, 02:04 PM
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#2 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Gear ratio
Approx 3 3/4 turns of the pinion to one turn of the axle.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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01-04-2011, 02:06 PM
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#3 |
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Registered User
Join Date: Sep 2003
Location: Boise ID
Posts: 609
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Re: Gear ratio
What is it with the 3.08's for comparison? That is the 4 speed truck gear ratio right?(3.08).
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"72" Red CORVETTE 4-speed 350 "70" Chevy Short Bed early stages of resto. Edel 600 cfm carb Weiand Stealth Intake HEI shorty Headers 4/2 Drop 295 50R 15 TOYO on 10 inch wide corvette rally rims at all 4 corners. "CHEVY RULES"
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01-04-2011, 03:18 PM
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#4 |
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Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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Re: Gear ratio
buying a 40 year old rear end i'd want to look at the gears to see condition// the numbers are stamped on the gears
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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01-04-2011, 08:08 PM
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#5 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Gear ratio
Just a smidge over 3 turns on the pinion for a 3.08 to 1 turn of the axle. The number represents a ratio of turns of the pinion to axle, like 3.73 to 1, or 3.73:1. 4.11 would be 4.11 turns per 1 turn of the axle.
cdowns has a valid point.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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01-04-2011, 09:07 PM
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#6 |
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sharp as a marble
 Join Date: Jan 2007
Location: atlantic beach,florida
Posts: 1,082
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Re: Gear ratio
I agree with CDOWNS, I would ask to remove the cover, and look for numbers on the ring gear. It SHOULD say something like 41-11, which would be a 411. If you see no numbers which I doubt, just count the teeth on the ring and pinion, bring a calculator, and divide the pinion by the ring gear and do the math. The other upside to pulling the cover is to look to see what the gears look like /// rusty, broken teeth, etc
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01-04-2011, 10:17 PM
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#7 |
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Registered User
Join Date: Oct 2003
Location: San Jose Ca.
Posts: 3,334
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Re: Gear ratio
I agree with cparman and cdowns remove that cover and see what you got inside. Also if I remember this right the numbers on the gears are 40 13 is a 307 and 41 11 is a 373. Or divide the big number by the little one and there you go.
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01-04-2011, 10:44 PM
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#8 |
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Registered User
Join Date: Aug 2009
Location: St. Paul MN.
Posts: 1,996
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Re: Gear ratio
I agree with the others, if I am going to buy I like to look first
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