if I went with the 3.4 Could I still use the stock 5 speed tranny that is behind the 22RE right now? would I also have to upgrade the T case?
The short answer.
No, I don't believe you can.
The long answer.
The transmission behind the 22E is the W56 (-E for the `93) with the RF1A
transfer case. The RF1A is a gear drive transfer case.
The 3.4
V6 has a R150F transmission with the chain drive transfer case (I don't know the #).
The engines have different bolt patterns for the bell housings and the transmissions have different bolt patterns for the bell housings as well.
The transfer cases have different bolt patterns to mate them to the transmissions.
You would need at least the R150F
transmission for the 3.4 V6. Marlin Crawler has an adapter ($349) to mate the RF1A transfer case to the R150F transmission. But, it would probably be cheaper just to get both the transmission and transfer case for the V6.
The other problem that you could run into, is which side is the drop for the front drive shaft. The Tacoma, which the 3.4 V6 comes in, has a driver side drop and your `93 has a passenger side drop. This is not hard to deal with because the `93 3.0 V6 trucks have the same transmission but the transfer case has the passenger side drop. So you could get the transmission and transfer case for a `93 3.0 V6
truck to mate to the 3.4 V6.
You will also need the complete engine wiring harness and ECC for the 3.4. A friend of mine asked me about swapping a 3.4 into a truck with the 3.0. I asked a mechanic friend this question because I had no experience with the V6 engines. He told me that it would bolt in easily, but you need the complete engine harness all the way into the cab to the ECC and the ECC because they are very different harnesses and ECCs.
FWIW, the V6 engines put out 150 to 170 HP IIRC. You can build a 22RE that makes that kind of HP and I feel that it would be less trouble than a V6 swap.