4.56 or 4.88 for 37s on JL rubi ?

[Jmw015]

If you spend a lot of time on the highway doing speeds of 70-75 mph and mpg is a concern, 4.88 is definitely what I would recommend. With 5.13's, you'll be pushing about 400 rpm more across the board and you will see a fuel economy penalty from it.

That’s what I figured. Thanks

 

[DWiggles]

What RPM's are you running at 75 mph? Just curious.

:idontknow: I honestly dont know, 2.7-3k? I guess, but I set the cruse at 80 mph often... I'll have to check the RPMS... never really worried about it because there is nothing I can really do to change it without an LS or 40s :idontknow: