# 14 Bolt a JunkYard, I cant figure out ratio?

Discussion in 'The Garage' started by Scott A, Dec 27, 2003.

1. ### Scott A1/2 ton status

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I found it on a 2wd 76 Truck.
I turn the tire 1 revolution and the pinon turns 2 times. Are there numbers on the pinon gear? I do see numbers on the ring gear.

2. ### Seventy4Blazer3/4 ton status

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what do all the numbers on the ring gear say? turning the tires is not that accurate of a way to tell.
Grant

3. ### Scott A1/2 ton status

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I did'nt write them down. I am going back today. They want \$119 for it.

4. ### Scott A1/2 ton status

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what should the numbers on the ring gear be for a 4.10?

5. ### Confedneck3/4 ton status

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for 119 bucks? a 14bff rear axle is a good deal no matter the ratio..

6. ### Beast3881/2 ton status

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[ QUOTE ]
what should the numbers on the ring gear be for a 4.10?

[/ QUOTE ]

On the ring gear you will find "41 10" or "41 11" as well as a long string of numbers. Those numbers are the number of ring and pinion teeth. You divide the larger number by the smaller to get the ratio. eg. 41/10 = 4.10:1 ratio. 41/11 = 3.73:1 ratio.

As far as junk yard diffs go, the 4.10's and 3.73's are the most common. But whatever you find, just do the math to figure out what ratio you are looking at. /forums/images/graemlins/thumb.gif

7. ### R72K5Banned

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also lok in glovebox for the RPO SPID label, it might lsit ratio, if is not the std ratio for the drivetrain put in it, but you never know it might have been swaped since 76, so yeah best bet is to pull the diff cover and look.

good luck

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