ring and pinion swapping
 

http://mazdatrix.com/g7.htm

i want a 4.3 rear, and apparently i can buy parts from mazdatrix, and not have to swap the rear from the impossible to find GTUs

what would i need to buy from that page?

or is it way more difficult than it seems and i should consider the hunt?

***want to sell me a 4.33 n/a mt rear? ;)

^^^

You need to have someone who knows what they are doing set it up. Contact Stan @ SDJ or ISC Racing, AWR or Speedsource

what ^ said. if you haven't dealt with rear axles or third members you may want to have someone knowledgeable on the subject help you or you could ruin your whole assembly.

I used a local 4x4 shop set up the lash. They do a bunch of work on diffs. You should make some calls locally. That way you can at least save on shipping.
-a