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Posted by MoparNorm [71.110.251.13] on Sunday, January 09, 2011 at 11:47:01 :
In Reply to: 4:10 VS 3:73 VS 3:54 Gears posted by Frank [207.119.8.3] on Saturday, January 08, 2011 at 10:02:24 :
A couple of things to consider:
1) You didn't mention tire size. That can be just as important and a lot cheaper to change than gear ratios.
2) A too tall gear will cause the engine to "lug" and hurt fuel economy just as much as a too low gear.
I just went from 3.73's to 5.13's (with 35" tires) and my fuel economy improved by 2 mpg). It all depends upon tire size, transmission ratios, gearing, engine cam, carb size, etc. etc., there is no 'magic bullet' but a combination of bad choices can add up to really hurt fuel economy.