With the 5 speed i have recently installed in my 68 impala my fuel mileage went from 17mpg up to 21.92mpg,is this a good result for such a big car with a 350ci

I would say it is. There are lighter vehicles with smaller engines that don't have that sort of fuel economy.

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jerv,wouldnt the 5 spd have a different final ratio throwing off the speedo?
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by allikatzpop on October 14th, 2007
The final drive is not in the transmission; it's in/on the differential.
Most FWD and some 4/AWD cars have a/the differential inside the transmission housing but most RWD and some 4WD vehicles have the final drive inside the rear axle. Solid-axle 4WDs have the same setup on the front as well. That "pumpkin ball" between the drive wheels isn't just a way to redirect torque from longitudinal to transverse; it also gears it down.
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by 8 Jan 2004-10 Dec 2009 on October 14th, 2007
jerv,i was talking if the high gear ratio in the old tranny was 1:1 and the new ratio is .78:1 would that throw off the speedometer the same way changing tire diameter would?
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by allikatzpop on October 14th, 2007
Oh. Honestly, I am not sure in this particular application as I don't know where each vehicle takes it's speed measurements from. Some take it off of a particular gear, some from the transmission's output shaft, some right off the axle or wheels....
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by 8 Jan 2004-10 Dec 2009 on October 14th, 2007
i couldnt tell you on a car. i know on big trucks it's taken off output shaft of the tranny.then you program in rev's per mile according to tire diameter.and the ecm does the rest
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by allikatzpop on October 14th, 2007
Yeah, but there is no ECU on a '68 Impala, so...
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by 8 Jan 2004-10 Dec 2009 on October 14th, 2007
it would depend on where the speedo drive attaches.usually the tranny,but,then would it attach to the new tranny in the same location? @ one time i owned a 66 chevelle but i cant remember where the speedo drive was (must be alzhimers kickin in)...questions,questions,questions.
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by allikatzpop on October 15th, 2007

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With the 5 speed i have recently installed in my 68 impala my fuel mileage went from 17mpg up to 21.92mpg,is this a good result for such a big car with a 350ci

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With the 5 speed i have recently installed in my 68 impala my fuel mileage went from 17mpg up to 21.92mpg,is this a good result for such a big car with a 350ci

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