Just upgraded to 37" tires!

[ljvsnyder]

That alone would make me want the terraflex setup.

[KaiserBill]

Of course changing the tire size has an impact on the transmission's ratios. This is the reason why when you put a 4.88:1 on the differential and you keep your stock gear set in the gearbox you end up with a 300-500rpm increase for cruising at 75-80mph. If you want to get back to say cruising at 2200rpm for that speed instead of 2700rpm, you need to have more gears in your gearbox i.e. a second overdrive. So another progressive step in the system to get back to stock configuration.

You are correct it is expensive to have a customizable gearbox; but it is hardly not worth it.

[UselessPickles]

You are correct it is expensive to have a customizable gearbox; but it is hardly not worth it.

Clearly. That's why so many people are customizing their gearboxes on the Wrangler

[KaiserBill]

Clearly. That's why so many people are customizing their gearboxes on the Wrangler

Some times it is just a matter of swapping out a gearbox for another. Sometimes you need to put doublers on the system to get the effective ratios you want without changing the gearbox. Hence the reason Atlas makes doublers for transfercases because it is easier to swap out a transfercase or add a doubler to the existing one you want. However, you could also achieve the same effect by altering the gears in the transmission or swapping one for the other.

My point is merely changing the differentials is not exactly a perfect way to get back to stock configuration. Something will be lost in the setup usually cruising speed at a specific rpm will increase. Unless you do something radically different with your transmission. Like say find a guy that will make you a custom 7spd gearbox or a custom set of gears for your existing box. So, you get a gear set in the differentials that are within a 1-200rpm of your stock configuration you're doing pretty good.