Originally Posted by haste
Hmmm, I may go with Redline MT-90(GL-4). I had it in my wife's '04 mazda 3 5-speed and it shifted like butter.
Any reason I shouldn't?
Yes. Ford doesn't recommend that fluid.
Redline doesn't recommend that fluid either.
Why not just use the correct fluid? Do you have a spare $2,000 for a transmission rebuild?