BAttitude7689

ok currently i have 98GT motor and tranny (auto) and im in the middle of swapping in a 2003 motor and tranny (auto). i did my research for what i need on the motor swap. I plan on using my 98' wiring harness and 98' computer. now my problem is.... will my 98' harness and computer work with the 03' tranny. the reason i ask is because the 03' tranny is control thru the computer for the speedo and my 98' i have a small black gear inside the tailshaft of the tranny to adjust my speedo correctly because i have 3.73 gears. i looked inside the side of the 03' tranny and dont see a gear on the shaft to grab onto my speedo gear to control the speedo. will the speedo work correctly?? will the tranny even shift at all because of the difference?? i really need all the help i can $$ is tight and this my daily driver. please all advice would be greatly appricated

Greatwhitehype

Did you ever find anything out? I'm in the same boat. I have a 96 mustang Gt and looking at buying a 2000 4r70w.