You can put in the 5-speed Getrag from the 2004-2005 models, but you will also
have to change a lot of other stuff - clutch, flywheel, mounts, axles, starter, clutch lines,
shifter and cables, etc. If you're going to do all that, you might as well go for a
Getrag 6 speed from the S - you have to change all of the above for that, too,
and although a 6-speed Getrag is more expensive than a 5-speed Getrag, with
all the extra stuff the bottom line isn't that much different proportionally.
If you do go for the 6-speed, get the later BKE(without LSD) or BKL (with LSD) 6-speed
from 7/2004-2006 as it has better gear ratios for the R50 than the earlier BKA one .
Also, check out this link (pdf article on the swap). http://personal.stevens.edu/~jdunn/F...heWeakLink.pdf