im looking into buying some 31 bfg a/t's. is there a need to re gear and if so. whats the down side if i decide not to regear

on a 88 samurai

Re-gearing will get you 4 MPG & 5th gear back, much better acceleration bla bla bla.

I've got 31" tires on my SJ410, and the only thing that makes it tolerable is the 2" exhaust, hi-flow cat & Doug Thorley headers. I really SHOULD get gears... but... I think I need to sell it to fuel other projects  :'(

how would i go about swapping out the t case?

T-Case is the easiest, and it gives you better gears for crawling as well.  With 31" tires the 4.8:1 kit would probably be just about perfect.

i was looking at the 4.8' and i was wondering if i send in my old t case will they give me money for the core charge or what?

i was looking at the 4.8' and i was wondering if i send in my old t case will they give me money for the core charge or what?

Are you buying a case with gears in it already? If so - there's probably a core charge. If you're just buying the gears, and installing yourself (I've read this can easily be done with hand tools & a weekend - search for writeups) there will be no core charge. Someone sells a gear kit with the split H (so you can get 2wd low) built in... petroworks maybe?

alright. but can i send in my old t case? or do you HAVE to buy there core aswell

alright. but can i send in my old t case? or do you HAVE to buy there core aswell

The core charge is their way of saying "We want your old transfer case in exchange for this new one."  They ship you a new case, and you ship yours back to them in order to get your core charge refunded.  Or you just swallow the core charge and keep your old case as a backup.

Some places, such as Trail Tough, offer to rebuild your transfer case and install the gears for you.  In that case you would send them your case, they install the new gears and do a rebuild, then mail it back to you.

alright thanks for the help on that matter. 

My pleasure.