Hello, I am currently in the process of installing a JDM transmission with 70,000 miles into my 98 3.4L 4wd. The next night I get a call from my mechanic (Toyota/Lexus service tech) Apparently the transfer case is about 3 inches longer on the JDM one than the OEM one therefore you need to shorten the rear driveshaft by 3" and extend the front one by 3" to compensate for them. Keep all the wiring harness, I think you need to swap them(just in case) I told him let's just swap out the transfer case from the old one he said he can't because the hardware is on the opposite side. The shifter is on the opposite side too so he is gonna see if he can install the OEM one. I had a hard time searching for an OEM 4wd 3.4L transmission so JDM was the only one I had to go for. People seem to take advantage of how rare they are so they mark up the prices. If I could do it again I would go with OEM unless you are into modifying driveshafts.