THIS. It's cheaper to find a low mileage take out than to try to build/have built a stronger RFE when you start putting power to these things. Got my last one here.
Very straightforward, disconnect, drop, replace, reconnect. You can use any 2wd or 4wd trans, they're the same with the exception of the end. 4wd will have the t-case adapter and 2wd just a tailshaft where the yoke goes in. I'm assuming you have 4wd so it'll be a bit more of a headache dropping it than a 2wd. If you reuse your stock TC, mark at least one set of bolt holes; if you aren't then it doesn't matter. Mark where your driveshafts connect to the diffs. If it's the first time you've separated the engine and trans, once you've double and triple checked you got all the bellhousing bolts, it may take some wiggling to get them apart. Highly recommend you download the factory service manual (available on this site) and read through the procedure. Also keeo in mind you will need a quicklearn performed once you're done or you can run the risk of possibly damaging your replacement trans.
