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1986 Chevy K10 truck stock rear end gear ratio?
I need to know what the stock gear ratio is for a 1986 K10 Chevy truck. Is there a coding system that will let me tell? The truck has a 4-speed manual (stock) and is running 31 X 10.50 tires. I need to find out what rear end it has so I can change to a taller gear for better mileage at highway speeds. Thanks for any help you can offer!
I have an '84 K-10 with a 4-speed and my truck has a label on the drivers side wheel well under the hood. This label has the VIN number along with all the other build information about your truck. It will have your gear ratio in this information.
I'm willing to bet that it is a 3.08:1. That was the standard gear ratio. There are other ratios that are optional such as 3.42, and 3.73. Although I do have a buddy that has an '85 GMC with a 4-speed and he clames that he has a 2.73:1.
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