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Author Topic: rearend gear ratio on standard 73 c10  (Read 7812 times)

Offline mark.comeaux.18

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rearend gear ratio on standard 73 c10
« on: February 21, 2015, 03:05:27 PM »
I want to know what gear ratio came original in my 73 c10 swb 307 2brl. thanks
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Offline zieg85

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Re: rearend gear ratio on standard 73 c10
« Reply #1 on: February 21, 2015, 03:18:59 PM »
Find your RPO sticker and see.  It could have come with several different ones
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Offline Irish_Alley

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Re: rearend gear ratio on standard 73 c10
« Reply #2 on: February 21, 2015, 03:20:16 PM »
you might be able to find the rpo codes in the glove box. other than that the only way to have an ideal is to inspect your rear differential
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Offline Captkaos

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Re: rearend gear ratio on standard 73 c10
« Reply #3 on: March 17, 2015, 11:54:55 PM »
Assuming it hasn't been swapped out in the past 42 years...
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Offline sbx22

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Re: rearend gear ratio on standard 73 c10
« Reply #4 on: March 22, 2015, 10:34:01 PM »
I remember reading that trucks originally equipped with v8's had 3.40 gearing, v6 3.73.
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Offline Blazin

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Re: rearend gear ratio on standard 73 c10
« Reply #5 on: March 24, 2015, 05:30:17 AM »
Could have been 3.08, 3.73, probably not likely but could have been 4.10. I would bet on 3.08, or 3.73, but it could have been  change in the last 40ish years.
V6 wasn't even offered until 83 if I remember correctly.
3.42s were not offered until 81/ 82ish either.
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Offline Captkaos

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Re: rearend gear ratio on standard 73 c10
« Reply #6 on: March 24, 2015, 12:21:45 PM »
The standard axle for 12bolts was 3.08, the standard for 10bolts were 2.76.  So if it doesn't specify on the RPO sheet it is one of these. 80%+ of these trucks came with this..
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