Thought that the numbering is just the "version". Most systems if it calls for a previous Mercon the V (5) will work. Its backwards comparable. I think the Mercon V is the only type you can get now days anyway.
Is their any thoughts on running something like Royal Purple MAX ATF or similar full synthetic "performance" ATF fluid in the rack?
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)