One swap to consider, The 2.4 from a Sport. This would be a SOHC 16V. Already a RWD and had the latest version of the KM132 gearbox available. This could well be the nicest improvement for the least work.
I have been working on 2wd swaps of the V6 and do not yet have the proper trans for an everyday swap. Mine currently has a Mazda RX7 gearbox and is fine for my needs but not what I would put in a truck. If you are interested in an automatic then again the Sport will be the doner, they have a 2WD automatic V6. There is one going in an early Toyota station wagon as I write.
I am working with 4 other guys around the world to come up with simple manuals swaps. The mates that have 2WD Tritons have a beefy transmission but not all the world got them. I have an AY6 conversion but it is far from an entry level swap. The next one for me to investigate are the Nissan gearboxes. I just need to get my hands on one. A guy out in Washington state says the belhousings are close and one of the adapters that I make might do it. The next step are what gearboxes adapt to the bellhousing. A T5 may not be hard and many of the other American boxes will go where they went. Mild machining needed to the bell and a plate made as needed.
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