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Old 11-08-2015, 08:11 PM   #1
2mas
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Duramax swap - Rear axle gear in c10?

Hi,
I'm doing a Duramax swap into my 65 c10.
Now I need to program the ECM to get the speedometer to show the right values.
I've been looking at old threads on gears. My 65 C10 had a V8 auto. Do you know what gear it has in the rear end?

I can read HA0415W on the axle, but I cannot find anything on it.
When turning the drive shaft 2 revolutions the wheel rotates almost one turn (one wheel in the air)

/Thomas
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Old 11-08-2015, 08:37 PM   #2
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Re: Duramax swap - Rear axle gear in c10?

The ratio is stamped on the ring gear. Remove the cover and have a look if you want to know for sure, but probably 3:73.
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Old 11-09-2015, 12:19 AM   #3
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Re: Duramax swap - Rear axle gear in c10?

Do you have any pics of your build?
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Old 11-09-2015, 04:55 PM   #4
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Re: Duramax swap - Rear axle gear in c10?

Common gearing for C10's was 3.73.
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Old 11-09-2015, 08:04 PM   #5
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Re: Duramax swap - Rear axle gear in c10?

Quote:
Originally Posted by jdl71 View Post
The ratio is stamped on the ring gear. Remove the cover and have a look if you want to know for sure, but probably 3:73.
This way is for sure! I found out this way I had a 1967 3:08 gear.
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Old 11-09-2015, 10:06 PM   #6
2mas
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Re: Duramax swap - Rear axle gear in c10?

Added link to my build thread in my signature.
/Thomas
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Old 03-01-2024, 12:14 PM   #7
Dan Castilleja
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Re: Duramax swap - Rear axle gear in c10?

What motor mount kit did you use?
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Old 03-01-2024, 01:12 PM   #8
bigmoe
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Re: Duramax swap - Rear axle gear in c10?

Quote:
Originally Posted by 2mas View Post
Hi,
I'm doing a Duramax swap into my 65 c10.
Now I need to program the ECM to get the speedometer to show the right values.
I've been looking at old threads on gears. My 65 C10 had a V8 auto. Do you know what gear it has in the rear end?

I can read HA0415W on the axle, but I cannot find anything on it.
When turning the drive shaft 2 revolutions the wheel rotates almost one turn (one wheel in the air)

/Thomas
Spin the wheel around TWO times and count the driveshaft revolutions.
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