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Re: 1966 C20 project
The most common gear ratio in the Eaton HO52's is the 4.57 gears. To get 3.73 gears you will have to go with either a 14 bolt or a Dana 60. In the '68-'72 trucks with a big block the Dana 60 was available with 3.54 gears. That would be a direct bolt in. If you end up with a 14 bolt or a different Dana 60, I do make the trailing arm mounts for those.
An HEI upgrade is not only a good reliable distributor but will give you about a 1 mpg increase. A good free flowing dual exhaust will help also. At some point you will likely want to address the brakes.
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