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Burning excessive gas.

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Old Jul 17, 2011 | 8:00 PM
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Default Burning excessive gas.

I have a chevy 350, 330 hp, Turbo 350 transmission with 373 rear end gears. Burns excessive gas, should I go down to 343 gears to save gas?

Engine in a 1966 Chevy C-10.
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Old Jul 17, 2011 | 8:16 PM
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From: kevinkpk
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Originally Posted by disgranny
I have a chevy 350, 330 hp, Turbo 350 transmission with 373 rear end gears. Burns excessive gas, should I go down to 343 gears to save gas?

Engine in a 1966 Chevy C-10.
Why would you drop the rear end ratio to save gas?
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Old Jul 17, 2011 | 8:38 PM
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What would you suggest?
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Old Jul 18, 2011 | 7:11 AM
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When's the last time you did a tune up?
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Old Jul 19, 2011 | 7:47 AM
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Who cares? This is a 350 carbureted with TH350 in a 45 year old sled. Fuel economy isnt an issue here besides we dont know what "it uses excessive gas" means. How do you drive? Are you a little old church lady or Mario Andretti? Is there a 2bbl or 4bbl on it? Lot of factors first before you decide to drop the rear end.
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Old Jul 19, 2011 | 6:48 PM
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That's true, RacerX. Too many unknown factors to make a definite conclusion.
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Old Jul 22, 2011 | 10:41 AM
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Hi disgranny,

Welcome to the Chevy Forums.


As to your problem, 373 to 342 won't be that noticeable, or

appreciable a difference. You would probably want to jump to

@the 323 range to see something noticeable, but due to torque shear

that might be inadvisable.

Not to mention the job will run @1200-1400$$, if you have it done.
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