Duramax swap - Rear axle gear in c10? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

2mas · 11-08-2015, 08:11 PM

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

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.

61_FL_Apache · 11-09-2015, 08:04 PM

Quote:

Originally Posted by jdl71

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.

**CHIZZLER** · 11-09-2015, 12:19 AM

Do you have any pics of your build?

TJ's Chevy · 11-09-2015, 04:55 PM

Common gearing for C10's was 3.73.

2mas · 11-09-2015, 10:06 PM

Added link to my build thread in my signature.
/Thomas

**Dan Castilleja** · 03-01-2024, 12:14 PM

What motor mount kit did you use?

bigmoe · 03-01-2024, 01:12 PM

Quote:

Originally Posted by 2mas

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.

11-08-2015, 08:11 PM	#1
2mas Registered User Join Date: Jun 2011 Location: Sweden Posts: 126	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 __________________ 1965 c10 BBW LWB - Duramax 2010 Camaro SS - Whipple (721hp) 2017 Volvo V60 diesel-hybrid (233hp) 2008 volvo XC70 diesel http://67-72chevytrucks.com/vboard/s...d.php?t=677577

11-08-2015, 08:37 PM	#2
jdl71 Registered User Join Date: Oct 2012 Location: Eldon, MO Posts: 1,753	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. __________________ Psalm 23 64 C10 66 K20

11-09-2015, 12:19 AM	#4
CHIZZLER SAVING ONE TRUCK AT A TIME Join Date: Feb 2010 Location: sherwood oregon Posts: 1,141	Re: Duramax swap - Rear axle gear in c10? Do you have any pics of your build? __________________ 53-suburban (99% done) 40-pick up (99.9% done) 12-cc lb dually D-max (dd) 61-crew cab D-max "PAY LESS FOR WHAT YOU NEED PAY MORE FOR WHAT YOU WANT" 53 BURBAN BARN FIND:http://67-72chevytrucks.com/vboard/s...d.php?t=404091 1940 PROJECT MOON SHINE:http://67-72chevytrucks.com/vboard/s...d.php?t=551088 1961 CREW MAX: http://67-72chevytrucks.com/vboard/s....php?p=6957999

11-09-2015, 04:55 PM	#5
TJ's Chevy Registered User Join Date: Mar 2013 Location: Southern Oregon Posts: 10,384	Re: Duramax swap - Rear axle gear in c10? Common gearing for C10's was 3.73. __________________ 1966 Chevy C10 "Project Two Tone" http://67-72chevytrucks.com/vboard/s...d.php?t=596643 1964 GMC "Crustine" semi-build:http://67-72chevytrucks.com/vboard/s...d.php?t=665056 My youtube channel. Username "Military Chevy": https://www.youtube.com/channel/UC_h...fzpcUXyK_5-uiw

11-09-2015, 10:06 PM	#6
2mas Registered User Join Date: Jun 2011 Location: Sweden Posts: 126	Re: Duramax swap - Rear axle gear in c10? Added link to my build thread in my signature. /Thomas __________________ 1965 c10 BBW LWB - Duramax 2010 Camaro SS - Whipple (721hp) 2017 Volvo V60 diesel-hybrid (233hp) 2008 volvo XC70 diesel http://67-72chevytrucks.com/vboard/s...d.php?t=677577

03-01-2024, 12:14 PM	#7
Dan Castilleja Junior Member Join Date: Apr 2012 Location: SF SD Posts: 63	Re: Duramax swap - Rear axle gear in c10? What motor mount kit did you use?

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