i cant find who it is but on marlin crawlers site in the gallery there is a photo of the inside of a 4th gen with a manual tcase and doubler. so it can be done, there is also a write up for the 2nd gen tacomas ill try and find. but it is pretty straight forward from what i remember. you take the shift sensors off your tcase and swap them over install on the tranny, cut the hole. then plug them in. then up in the cab you find the 4wd ecu and unplug it and short two wires to retain the proper 4wd lighting on the dash. what i dont know is if it disables the Atrac or not and or the DAC, or if it turns off vsc once this swap is done. but i plan to do this swap once the actuator seal on mine decides to go bad.