71 K-10 ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gmtruck71 · 01-01-2003, 08:37 PM

The rear axle on my 71 K-10 failed. It has a 3.07 gear. I would very much like to change to a higher ratio such as 3.42--3.55, but not as high as 3.73s. It seems the only ring and pinions available are 3.07 or 3.73s. The front end is dana44 and the rear is corporate 12 bolt. I am going to go back with a auburn posi unit in the rear. Does any one have any input on how to find a matched set of gears for the front and rear (already have tried most aftermarket sources) or is there other diffs from other years that may work with little modifications.

Mudder · 01-01-2003, 08:55 PM

The 3.73's are more common and would work well for you. You could actually go to maybe a 32 or 33 inch tire with 3.73's.

01-01-2003, 08:37 PM	#1
gmtruck71 xwrench2003 Join Date: Jan 2002 Location: Louisville, Ky Posts: 112	71 K-10 ? The rear axle on my 71 K-10 failed. It has a 3.07 gear. I would very much like to change to a higher ratio such as 3.42--3.55, but not as high as 3.73s. It seems the only ring and pinions available are 3.07 or 3.73s. The front end is dana44 and the rear is corporate 12 bolt. I am going to go back with a auburn posi unit in the rear. Does any one have any input on how to find a matched set of gears for the front and rear (already have tried most aftermarket sources) or is there other diffs from other years that may work with little modifications. __________________ Marty Hall 1971 K-10 LWB Cheyenne (461\T-400) 93 S-10 Blazer (330,000 and still going) 86 SS Monte Carlo (40,000 miles) 85 Chevy Scottsdale 02 Jeep Liberty

01-01-2003, 08:55 PM	#2
Mudder Registered User Join Date: Feb 2001 Location: East Central, MO Posts: 11,339	The 3.73's are more common and would work well for you. You could actually go to maybe a 32 or 33 inch tire with 3.73's.



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