jagman454

if i get 4:10 gears will i be burning alot more gas? i got a AOD right now and soon to be a T-5 in summer (dear god please)

OneFine89Mustang

no i have and aod and 4:10 i didnt see any difference in gas mileage

Stevens91gt

people say there is..but not too much
if u drive on the streets all the time
they can help is what ive heard..
unless ur always on the highway

sayos

So I figured out what a different gear ratio will do to the engine's rpm.. You take the differance in ratio of the new gear and the old one: 4.10 (new) and 3.08 (my old one) 4.10 - 3.08 = 1.02. Then you take that (1.02) and devide it by the original gear ratio (3.08). 1.02 / 3.08 = about .33 Take your target rpm (to see how much it will jump with the new gear ratio) say 2000 rpm and multiply it by the % it will jump (.33) 2000 x .33 = 660 you add it to your target and you get your new 2660. it works for any rpm, as your rpm will cange the higher it gets with a new gear ratio.
.33% is the how much change you'll see in rpm.

4.10 - 3.08 = 1.02
1.02 / 3.08 = .33
(target rpm) x .33 = new rpm
make sense?