What would be the gas mileage increase by changing the transmission to a overdrive with a rear ration of 2.78?
by 70 Torino Guide on Friday, September 3rd, 2010 | 3 Comments
This would be for a mid-size car from the 1970s with a rebuilt 350 CI engine. It would weigh around 3700lbs. I currently expect it to be around 15 MPG, but would like to get close to 20.
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Stay away from the overdrive. Due to the internal dynamics, they are less efficient then direct drive.If you are trying to lower your cruising rpm, just change the rear end gears.
in general, low engine speed and higher hi gearing gives slightly better milage
the 1970′s were gas hogs and always will be
15 to 20 mpg would be a 33% = 5 increase over 15 gain. Impossible with those systems
I get 45 mph in the hybrid Prius. 65 hp gas engine and 60 + electric. the big gain comes form shutting off the gas motor at every possible opprtunity.
Electrics are the future. the age of oil cannot possibly last much past 2050
Gas internal engines are one of the most inefficient of all systems
Ug, I’m by no means a car expert. But in situations like this you really need to look at what it’s going to cost to change something like that.
Odds are you’d spend thousands to have someone rebuild the transmission only to find out that it’s going to take you 5-20 years to make that up in saved gas.
So honestly. If you want better gas mileage for free, keep your tires inflated properly and figure out what you can toss out of that 3,700 beast that isn’t necessary. That right there could save you a bit.