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-   -   Help with gear ratio I.D. (https://67-72chevytrucks.com/vboard/showthread.php?t=632111)

Sklptrljay 06-11-2014 05:41 PM
Help with gear ratio I.D.
 
Talked to a guy who has a 69 1/2 ton rear end for sale, he didn't know the gear ratio. I told him to look on the ring to find the stamped numbers, he said he doesn't see them. So he said he counted the teeth 3 times and swears it's a 43/11 which would make it a 3.91 by my calculations.

Well, I can't get over there for about a week. So just wondering, was there a stock gear ratio like this?

Fitz 06-11-2014 08:42 PM
Re: Help with gear ratio I.D.
 
Quote:
Originally Posted by Sklptrljay (Post 6717190)
Talked to a guy who has a 69 1/2 ton rear end for sale, he didn't know the gear ratio. I told him to look on the ring to find the stamped numbers, he said he doesn't see them. So he said he counted the teeth 3 times and swears it's a 43/11 which would make it a 3.91 by my calculations.

Well, I can't get over there for about a week. So just wondering, was there a stock gear ratio like this?
No. 3.48:1, 3.73:1, 4.11:1 only no 3.91:1 in a half ton 8.875 truck differential.

King Cary 06-12-2014 01:14 AM
Re: Help with gear ratio I.D.
 
Rotate the right side axle 360 degrees and count how many time the pinion rotates. You will have your answer... Say it has a 3.73, the pinion will rotate 3.73 times..

hamjet 06-12-2014 06:52 AM
Re: Help with gear ratio I.D.
 
It's brobably more like 41/11 which would make it 373, unless its not a half ton 8.875 diff...


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