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Old 10-17-2006, 03:33 PM
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55 Chevy Truck Rearend Ratios

I am rebuilding a 55 2nd series chevy truck. I have had the original 235 engine and 3speed transmission rebuilt, but I think I want to change the rearend ratio, while keeping the same housing. It currently has a 390, but I think going to a higher ration (338, 307, 278?) would serve my needs better. I won't be towing with the truck, I would like to get a little better gas mileage in town, and would like to drive faster on the rare occasions that it will be on the interstate.
My concern is that I will spend $400 on a new ring and pinnion, but will see very little in the way of fuel/rpm savings and speed increases. Is there experience out there with this conversion? Thanks for the inputs -
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