1976 C-20 standard axle ratio? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1976gmc20 · 08-07-2015, 11:01 AM

I just checked my glove box sticker and there is no axle ratio listed so I assume that it is whatever was "standard" at that time.

1976 GMC C-20 350/SM465

It had 8.75x16.5 tires from the factory (not anymore!) if that makes any difference.

I'm just curious. Any of you experts know what would have been the standard rear axle ratio for this pickup ???

thanks

Keith Seymore · 08-07-2015, 12:24 PM

You are correct: if no axle is listed then that would be the base axle. Sometimes it shows RPO GQ1 "Standard axle" (but does not specify the numerical ratio).

In your case, according to the generic info packet in the GM Heritage Center archive, it would be 3.73.

https://www.gmheritagecenter.com/doc...olet-Truck.pdf

K

1976gmc20 · 08-07-2015, 05:41 PM

Thanks!

I kind of figured it was 3.73. With the bigger tires (245/75R16) it moves out pretty good on the highway. The speedometer appears to be reading about 10% low.

08-07-2015, 11:01 AM	#1
1976gmc20 Registered User Join Date: May 2015 Location: Montana Posts: 3,696	1976 C-20 standard axle ratio? I just checked my glove box sticker and there is no axle ratio listed so I assume that it is whatever was "standard" at that time. 1976 GMC C-20 350/SM465 It had 8.75x16.5 tires from the factory (not anymore!) if that makes any difference. I'm just curious. Any of you experts know what would have been the standard rear axle ratio for this pickup ??? thanks __________________ Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner

08-07-2015, 12:24 PM	#2
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,226	Re: 1976 C-20 standard axle ratio? You are correct: if no axle is listed then that would be the base axle. Sometimes it shows RPO GQ1 "Standard axle" (but does not specify the numerical ratio). In your case, according to the generic info packet in the GM Heritage Center archive, it would be 3.73. https://www.gmheritagecenter.com/doc...olet-Truck.pdf K Attached Images __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/

08-07-2015, 05:41 PM	#3
1976gmc20 Registered User Join Date: May 2015 Location: Montana Posts: 3,696	Re: 1976 C-20 standard axle ratio? Thanks! I kind of figured it was 3.73. With the bigger tires (245/75R16) it moves out pretty good on the highway. The speedometer appears to be reading about 10% low. __________________ Current/past Chevy/GMC trucks: 1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner

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