Tell us more about how you plan to use the truck. Hot Rod? Daily driver? Just weekends? What kind of highway driving?
I own a 1965 C10 and I decided to go with a 5 speed overdive manual transmission.
Do you know what rear diff raio you have? What engine will be in the truck?
Jay

1965 Chevy C10 Shortbed 1/2-Ton Stepside
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