gears ratio for 70 c-10

[unklbill32]

I am wondering if anybody would know what gear ratio is in my 70 c/10 4x4 swb stepside 307 3sp on the column. I have a front differential out of a 8? Blazer with disc was wondering if it would work? I dont plan on using the 4wd. Its a cruiser. Thanks in advance
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[70c10stepside]

Do you know what your rpm is at 55?

[unklbill32]

No, I haven't had it on the road in about 14 years. Im finally getting around to a rebuild
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[70c10stepside]

Ohh. 10 bolt or 12 bolt?

[unklbill32]

I will check tomorrow. Thank you for your help. Would it matter if I dont plan on using the 4wd?
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[SS Tim]

3.73 gears were stock without option in your application. Check out post #12 of my thread here. However it could be anything 43 years later, be best to pull the rear cover and check.

http://67-72chevytrucks.com/vboard/s...6&postcount=12

[unklbill32]

Thanks guys for the info
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[70c10stepside]

Originally Posted by unklbill32

I will check tomorrow. Thank you for your help. Would it matter if I dont plan on using the 4wd?
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If I had a vehicle that was 4x4, and did not plan on using it I would swap over to a 2wd front end. Just because that is extra weight and what not up front burning up gas.. This being that this would be easy to do. I really dont know much at all when it comes to 4x4 lol

[SS Tim]

Actually you should match the ratios front and rear to keep the system intact. We both know it snows there, sometimes a lot. Plus when it comes to resale nothing kills value faster than an axle problem as buyers always suspect a lot more problems.

[oldman53]

hi , you take the number of teeth on pinion and divide it by the number on teeth of your ring gear that will give your ratio

[SS Tim]

Originally Posted by oldman53

hi , you take the number of teeth on pinion and divide it by the number on teeth of your ring gear that will give your ratio

Actually that is backwards. You divide the ring gear (large) by the pinion (small) and the result is the ratio. In this case it would be a 41 tooth ring divided by an 11 tooth pinion for a ratio of 3.727:1.