Geep 2010

Is 4.88 the highest gear ratio available for the Dana 30 or will 5.13 gears work. Running 3.73 auto with 35s on d30 front and d44 rear.
Thanks

erol1991

5.13 will work on dana 30, check out northridge
http://www.northridge4x4.ca/proddeta...VERHAUL&cat=36

wayoflife

you can run 5.13 and a lot of folks are doing just that

rdubb1031

Any negatives to running 5.13 w/ the d30?

erol1991

your jk might explode

wayoflife

a couple. first off, the higher gear ratio will cause your front drive shaft to spin really really fast and if you're running an aftermarket u-joint style shaft, it will vibrate pretty good if you have too much caster and/or don't have it balanced perfectly. over time, this can cause your t-case to crack. i have seen this happen many times one multiple JK's including mine. the other problem is that on a dana 30, the pinion gets to be really small on a 5.13 and this can potentially be a weak point when wheeling hard.

rdubb1031

All stock from my point of view. Teraflex lift (2.5") and Nitto 35s only. will I be asking for trouble?

sa29560

Doesn't sound too dangerous. 5.13s will help with the power loss and because you already have 3.73s you don't need a new carrier which saves a little bit of cash.

I have been shopping around in the greater metro area for pricing on gear installs, if I come across something reasonable I will be sure and post it up

rdubb1031

Thanks let me know.. Actually I'm running stock 4.10s.. apparently the previous owner paid for the upgrade.. so the power loss hasn't been all that bad.. Don't get me wrong, running up to Copper sure is a struggle. any concerns with 4.10s and the setup I listed above and changing to 5.13s?

sa29560

Sorry I misread that, I have 4.10s as well and I am deeply considering 5.13s. I know after I get those 35s I will really be itching to gain some power back. For now my JK does fine though, Copper is the place to ride. I can hope the 5.13s help with gas mileage and uphill cruising during these CO winters as well. It usually takes me a little over half a tank each way to go riding right now.