dylan91xj

I have a 231j tcase right now. I plan on running d60 and 14 in rear or d60 rear. Do you think my t case will be strong enough to handle the big axles on 37s?

also what does the J mean (NP231J)

96_xj

j for jeep
d for dodge
HD for HD one.

and yes it will be fine, I would recommend the HD upgrade (bigger chain)

but you will be fine

SeriousOffroad

For added strength build a 6 planatary low range for it or install a TeraLow 4:1.

96_xj

Tera Low kits are prone to leak even under a stock cherokee....

builtnotbought89'

If your gonna do a 60/14bff swap you might as well just build a 231/300 doubler!

SeriousOffroad

Can't say I've ever heard that before. I've got a few friends running them too.

I've installed some of them and see no reason why they would leak if installed properly.

Some applications do require an additional seal.

builtnotbought89'

What's the tera low kit run ya?

SeriousOffroad

Unfortunetly I can't use one. They don't make one that mates to a GM tranny.

dylan91xj

Ive heard about doublers what are they?and where can i get them?

96_xj

Doublers do require a little bit of work.

here is a good write up

http://www.rockhardxj.com/viewtopic.php?t=1686

SeriousOffroad

Do a google search for Box For Rock. There's also alot of info on Pirate4x4 for anyone that wants to build a 231/231 or 231/300 doubler.

dylan91xj

So correct me if im wrong but it allows me to put the transfer case in lowx2 4wd

96_xj

front digs, and low-low. yes. it is a GREAT option. you can also just 2wd and use the gear reduction

N20jeep

its hilarious to drive in 2 low

dylan91xj

okay thamks for the thread advice it was alittle confusing cause i dont know alot about the gears and the whole purpose of the doubler