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Old 07-03-2006, 05:15 PM
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it should get a little better mileage than that, you can buy a new Q jet carb for 150 at o reilly auto parts i got one for my '77 4x4 with the original 400 sb in it and it really good on gas alot better than your c-10 is getting by FAR

its all in the carb

run a Q jet

they are fuel efficient, more than other carbs are

or get a car or later truck,

also your axle would be 3.42 not 3.41

there was also 3.40 in these trucks these years it was RPO code HE4

check RPO sticker in glovebox

you may be confused with the 2.41 ratio of the late '70s GM 7.5" 10 bolt axle cars




good luck
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