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-   -   Duramax swap - Rear axle gear in c10? (https://67-72chevytrucks.com/vboard/showthread.php?t=687936)

2mas 11-08-2015 08:11 PM
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

jdl71 11-08-2015 08:37 PM
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.

CHIZZLER 11-09-2015 12:19 AM
Re: Duramax swap - Rear axle gear in c10?
 
Do you have any pics of your build?

TJ's Chevy 11-09-2015 04:55 PM
Re: Duramax swap - Rear axle gear in c10?
 
Common gearing for C10's was 3.73.

61_FL_Apache 11-09-2015 08:04 PM
Re: Duramax swap - Rear axle gear in c10?
 
Quote:
Originally Posted by jdl71 (Post 7369276)
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.

2mas 11-09-2015 10:06 PM
Re: Duramax swap - Rear axle gear in c10?
 
Added link to my build thread in my signature.
/Thomas

Dan Castilleja 03-01-2024 12:14 PM
Re: Duramax swap - Rear axle gear in c10?
 
What motor mount kit did you use?

bigmoe 03-01-2024 01:12 PM
Re: Duramax swap - Rear axle gear in c10?
 
Quote:
Originally Posted by 2mas (Post 7369240)
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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