If, your tranny is a g58, then you must have a 4cyl and in that case you have a gear driven t-case. So doing a dual or changing gears is no prob.
If you have a V6 then you have an R150 and then yes with an additional adapter you can convert to a gear driven case with all the same options.
When you go from 33's to 36's you will want to change your r&p too. The t-case gears won't help you on the street, only when you're in low range. 5.29's are just about right for 36's.
Here's a little more info....
http://www.marlincrawler.com/trans.html
