http://forums.nasioc.com/forums/showthread.php?t=1201152 Started this over on Nasioc, but wanted to post it here as well. I will update here as I get more information. If you guys have anything to add please feel free! The thread here should be a bit more streamlined without all the bs that I am sure will eventually happen on NASIOC. 04 USDM Sti 6 speed: -transmission -driveshaft from an automatic or from Sti with some modification? -3.90 R&P gear to replace the 3.54 in the WRX OR -R180 rear differential and Sti hubs, rotors, brakes and axles -6 speed shifter and assembly -front axles can be reused? -DCCD controller optional but recommended 04 JDM Sti 6 speed: -transmission -driveshaft again -3.90 R&P gear to replace the 3.54 in the WRX OR -R180 rear differential and Sti hubs, rotors, brakes and axles -6 speed shifter and assembly -front axles can be reused? -some seem to be DCCD and others non-DCCD with Viscous LSD 05 USDM Sti 6 speed: -transmission -driveshaft -3.90 R&P gear to replace the 3.54 in the WRX OR -R180 rear differential and Sti hubs, rotors, brakes and axles -6 speed shifter and assembly -hubs or Stubs? Not clear on this one for the front but it seems there is extra that needs to be done with an 05 -DCCD controller optional but recommended 05 JDM Sti 6 speed: -transmission -driveshaft -3.90 R&P gear to replace the 3.54 in the WRX OR -R180 rear differential and Sti hubs, rotors, brakes and axles -6 speed shifter and assembly -hubs or Stubs? Not clear on this one for the front but it seems there is extra that needs to be done with an 05 -Again not clear, but seems some come without DCCD 06 USDM Sti 6 speed: -transmission -driveshaft -Stock R160 can be used without changing the gear ratio due to change in 06 that makes the ceneter diff a 1.1:1 vs the old 1.0:1 -stock Axles can be used on rear due to no need to change the rear diff -front...replace the Stubs with either WRX stubs or some other...not clear on this either, but it seems that some stubs can be ordered along with seals and clips that retains the WRX front Axles, hubs, etc? -6 speed shifter and assembly -DCCD controller optional 06 JDM Sti 6 speed: -transmission -driveshaft -6 speed shifter and assembly -no clue -no clue -no clue 07 USDM Sti 6 speed: -transmission -driveshaft -6 speed shifter and assembly -no clue -no clue -no clue