effect on mileage-gear change? - JeepForum.com

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post #1 of 2 Old 05-01-2012, 07:29 AM Thread Starter
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1979 CJ7 
Join Date: Mar 2002
Location: near Conway, Arkansas
Posts: 37
effect on mileage-gear change?

I have a 1979 CJ-7 with a 304-V8, and I am running KM2s which is a 35" on a 16" wheel, body lift 2", suspension lift 4" -- with standard gears right now. I am happy with the 9 mpg or so I get but ask:

If I have my shop change out the gears, how does this affect mileage, if at all? I think I understand that the engine runs at low rpms when you are running a larger tire and was just curious if there is a big change when you change gears which as I understand it will get the jeep back to his normal factory power after a gear swap to account for the larger tires.


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post #2 of 2 Old 05-01-2012, 10:00 AM
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1993 XJ Cherokee 
Join Date: Mar 2012
Location: El Paso
Posts: 44
Your gas mileage will improve if you get taller gears. Your engine doesn't have to work as hard to get those bigger tires moving.
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