Regear fuel consumption implications?
Thread Starter
JK Newbie
Joined: May 2009
Posts: 71
Likes: 0
From: South Africa
First thing to help your mileage is get your speedometer corrected with an automatic if you haven't done so. Shifts are determined by throttle position, engine rpms and speed, so if the speedometer is off, so are your shifts. It doesn't matter what tool you use to get it done, be it an AEV ProCal or Superchips.
With 4.10s and 33s you aren't severely under-geared, but close. Getting the appropriate gear set underneath will help prevent some downshifts, which rob fuel economy by unlocking the converter and higher revs. 4.88s at minimum would be the right call unless you have your sites set on some bigger meats.
With 4.10s and 33s you aren't severely under-geared, but close. Getting the appropriate gear set underneath will help prevent some downshifts, which rob fuel economy by unlocking the converter and higher revs. 4.88s at minimum would be the right call unless you have your sites set on some bigger meats.
I don't have sights on going bigger than 33's, but if I had to go to 5.13's now which negative influences are there?
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
If you drive in an area with lots of hills, the 5.13s are going to provide some efficiency by not kicking down as much and unlocking the converter.
If you drive mainly on highway and city flats, they are likely to hurt efficiency with 33s.
If you're seeing double kickdowns with the 4.10s in your regular driving then by all means I would run with 5.13s. If you aren't and rarely seeing any kickdowns I would go with the 4.88s.
The bigger question is do you really believe you won't be venturing into 35s at some point.