weight and final gear ratio

[JT1]

Thank you Crazy for following up on this, these are the thoughts i'm looking for. isn't there about a 5% rpm increase between 4.88 and 5.13? Also thanks for the feedback on your practical experiend. alot of people like to up thier post counts on the forums and are only parroting back what they've read on other threads.

What I don't want to have happen is to throw on my wheels/tires, lift bumper AND THEN toss in another 300-500lbs in passengers and cargo and not be able to HOLD 70 or 75 in 8th without jumping back and forth to 7th. i live in the valley in Arizona but my jeep is a driver, i take it to Colorado and the sierrias multiple times a year. the handfull of shops here say 4.88 and won't acccept any further questions, basically .

The difference at speed in 8th gear between 4.88s and 5.13s is about 120rpm. As weak as the 3.6 is down low, I'd opt for the RPM.

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[CrazyCooter]

The difference at speed in 8th gear between 4.88s and 5.13s is about 120rpm. As weak as the 3.6 is down low, I'd opt for the RPM.

I never think about the ratio in terms of rpm difference until the final cruise number I give the client because it's really all about what percent of change.......

The trans ratios being 7th 0.839 and 8th 0.667 is almost a 21% difference right there alone! A hypothetical 2000 rpm cruise is a 410 rpm difference between them.

That makes the difference between 7th and 8th almost exactly the difference between 4.10's and 5.13's. If a person has 37's already and likes the highway cruise in 7th........5.13's is the winner!