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Re: Rear gears
Depending upon the engine power and tire size, you may be ok with that gear and the TH400 transmission. The 700r4 is never going to get along with the 3.07 though, especially with a carburetor.
While it seems like lower RPM at highway speed would mean better fuel mileage, it is not necessarily the case.....again especially with a carburetor. The engine has a "sweet spot" in the RPM range where it will cruise the best. Fuel mileage and acceleration are both improved at this point.
If the cruise RPM is too low, mileage suffers because the carburetor is running in the idle and/or transition circuits instead of the main jets where it should. An overdrive transmission will shift in and out trying to compensate, this does not help matters.
Then if you need to accelerate, even slightly, you have to get too far into the throttle, maybe even kicking down to the next gear. This is another mileage hit.
Of course the opposite is true too. If your gearing puts the cruise RPM too high, it is just as bad.
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Originally Posted by Longhorn Man
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The directions are nothing but another man's opinion.
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Learn from the mistakes of others, you won't live long enough to make them all yourself...
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