gas, tires, and gears - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 06-19-2009
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Icon5 gas, tires, and gears

i know if you go up to bigger tires you go to lower gears. duh. but im just wondered something. i want to go to 33s and a 4.10 or 35s and a 4.56. normal right? well when you put gears in your truck i know its to help the tranny and power and all and i know it helps mileage but how is the mileage supposed to be with lower gear and bigger tires compared to stock? should it be the same or near the same with the lower gear when you put the bigger tires on? im very aware that if you want good gas mileage to not lift the truck and all that, thats not why i ask, just wondering how it will work when i decide what i want to do to my truck when it comes to my next set of tires, and wondering how that stuff works. comparing to gas mileage of a stock truck or near stock.
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Old 06-19-2009
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there are some people that are running 4.10s and 35s they would give you decent mileage on the highway but suck around town and 4.10s are a good around gear for 33s and 4.56s are a good all around gear for 35s
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Old 06-19-2009
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i know what gear is good for what size tires. im just wondering how it compares to stock
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Old 06-19-2009
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Less gas mileage than stock. Your adding alot of rotational inertia and rolling resistance even when properly geared.
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Old 06-19-2009
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big difference?
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Old 06-19-2009
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If geared properly the difference shouldn't be to much.
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Old 06-19-2009
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even if you get your gearing back what the equivalent of stock was, you will lose some mpgs...why? because you are still having to move MORE weight. You have to figure out your final drive ratio when stock, then recalculate it with your new tire height and gear ratio selection. Theres tons of calculators out there that let you compare stock gearing vs bigger tires and different gears. If I were swapping out gears, Id get something that would bump up my rpms a bit higher than what it wouldve been stock to compensate the extra weight....ie..if stock you did 2K RPM @ 65mph...Id go with some gear that would put me at 2500 RPM @ 65...thats just my opinion though.
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Old 06-19-2009
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Check this out on TRS.

Very handy chart of what gears should be used with what tire size and your desired driving purpose.
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