This Site Might Help You. RE: 3000gt automatic to manual conversion? ive had so many problems all transmission related the mits rebuilds are worce then the. Mitsubishi 6G72 Twin Turbo 3000GT VR4 / GTO / Dodge Stealth Engine, Manual 6SPD Trans, Harness, & ECU JDM 6G72. Black 1993 Stealth RT/TT and a Red 1994 FWD TT Base 3000GT. Do a search for 'ATX conversion' and you will find tons of. Converting Transmission: Auto to Manual?
I have completed the ATX to MTX Swap and it is not hard at all if you have enough knowledge to drop a transmissions and change out parts. Do a search for "ATX conversion" and you will find tons of threads. Yes the Clutch Master is the hardest part of the conversion. You can buy a conduit punch to make the large hole believe its a 1 1/4 but you need to search to make sure. I just used my dremel and a cutter bit to cut mine out. It was easier for me as I had the dash out of the car so plenty of room to work.
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YOU DO NOT NEED A NEW ECU! The ATX trans has its own computer mounted on the floor behind the center console. Just remove it send sell it once you complete the swap. Here is a list of the parts you will need to complete the swap: shifter assembly, shifter cables, brake and clutch pedal assembly, slave cylinder, master cylinder, lines, starter, passenger axle, drivers side intermediate shaft, starter, flywheel, clutch kit, engine to trans brackets and the trans.