Rcampbell

Hi guys. New on this forum. I have a 1999 Tacoma with a 2.7. I'm currently running a 33 inch tire and its starting to turn into a dog for top end which was expected. I currently just bought a 04 Toyota with a 3.4. I want to put the 3.4 into my 99 that has the 2.7. Now I was wondering if I'd have to change the entire harness computer and all or is there a adapter or crossover that I can buy to save the hassle. Any help appreciated. Thanks