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Re: what do you think
Quote:
Originally Posted by wibilly
i wanna up the mpg's in my 69 so maybe i can hit some board meets this summer. i have astock 350 [ 1980] 4 speed and 3.73s would i do better with a 700r4 with the 3.73s or with the 4 speed and 3.07s i hate to part with my 4 speed, thats what makes it a truck imo. i'm in the 13 - 15 mpg range now with this truck
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13 to 15 mpg is in the normal range for a carb'd 350 in these old trucks. Of course there are some exceptions but most will tell you that's about right. If you want to work this truck as it's intended you probably want to keep those gears and trans. Dropping down to the 3.07 gears will lower the rpm by a couple hundred but may not increase the mpg by all that much. Some do but not all. Too many variables. Besides, I am not all that impressed with the 700 series trans. I hear you can build one up to handle all kinds of HP but if GM built them like the old 400's you wouldn't have to.
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Boog
69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver
primer is finer
91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said.
I stand for the flag and kneel at the cross
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