yeah, those stock gearing ratios were all set to specific axles and specific packages, like the towing package, or Up Country package and what not. typically, these are the gears you can use on either the lower and higher carriers will allow for each axle:
Dana 30: lower=3.55 and down, higher=3.73 and up
Dana 35: lower=3.31 and down, higher=3.55 and up
Dana 44: lower=3.73 and down, higher=3.92 and up
Chrysler 8.25 (both the 27 and 29 spline versions): 2.56 and up use the same carrier, with obvious variation being on the spline count of the specific axle.

 

now this is real confusing... and im pretty sure i would have to disagree with all of them... the lower the gear the higher the number... and them numbers are all wrong...

3.07, 3.55, 3.54 all on the smaller carrier or "higher gears"
3.73, 4.10, 4.11, 4.56, 4.88, 5.13 all the larger carrier "lower gears"

the carrier brakes what i posted already... what you posted here is all backwards and confusing...

 

ok thanks! I guess I have some research to do. And some junkyard searching as well.

 

In theory, if you have the NP242 tc, you could drive with two different gear ratios in 4wd full time, the central differential would take care of the ratio difference. Anyway if you stay in 2wd you can temporarly do that.

 

ok I have one more question, please bear with me guys, I don't know much at all about all this gear stuff. I found this on ebay... Will it work and is it worth it?
http://cgi.ebay.com/ebaymotors/JEEP-...Q5fAccessories
thanks again for all your help!

 

the front will bolt in... the rear you will have to modify... your jeeps rear leafsprings... the rubicons have rear coil springs... really not that hard to do though...

 

yeah, i just realized that now coming back to it. when i say "lower" in the original post, i should have said "smaller carrier," and "higher" meaning "larger carrier." i think i was going somewhere with the ring gear, higher being the larger gears, and lower being the smaller gears.

sorry if that messed anybody up

 

he meant numerically....as in 3.07 is numerically lower than 3.55....and i do agree with his numbers because i have been looking into re-gearing my '91 w/ 3.55s to 4.10s and need a new carrier

to the OP: for the front you will need a new ring gear, pinion gear, carrier, and master rebuild kit (i priced this at around $300 without shipping or labor) or you could find a factory 4.10 D30 from a 4cyl XJ

for the rear I would suggest looking for a Ford 8.8" rear, they can be frequently found with factory 4.10s and sometimes LSD, they require new spring perches and shock mounts that will need to be welded on, I priced this to less that $100, but does require good welding

 

he meant numerically....as in 3.07 is numerically lower than 3.55.... yes i know this but in REAL gear talk this is not correct and this is what confuses everyone... and i do agree with his numbers because i have been looking into re-gearing my '91 w/ 3.55s to 4.10s and need a new carrier i know u need a new carrier... from what he said you WOULDNT need a new carrier... which is wrong... so how do you agree?

to the OP: for the front you will need a new ring gear, pinion gear, carrier, and master rebuild kit (i priced this at around $300 without shipping or labor) or you could find a factory 4.10 D30 from a 4cyl XJ

for the rear I would suggest looking for a Ford 8.8" rear, they can be frequently found with factory 4.10s and sometimes LSD, they require new spring perches and shock mounts that will need to be welded on, I priced this to less that $100, but does require good welding... is a good choice also and swaps you to disc brakes... moding to the parking brake will need to be done also...

 

Not a rumor. The 4:56 gearing was used with the 4cylinder and AW-4 trans in early XJ/MJ's. These were not common obviously.