If ya want to do this, Terry Haines got ahold of me and wrote:
Originally posted by HMS Motorsports:
re The final drive ratio post.As we have stocks of the
parts needed to convert to a Zetec FDR we can do the
swap for a parts cost of around $300 (not counting
labor and any other parts needed for repair/upgrade)
Vs the cost of parts from Ford at around $1,000.This
is only for shipped in transmissions.We do not sell
these parts as mail order but keep them for our own
customers.
So if ya send in the tranny to him (for some upgrades, possibly some repairs also), he can change them out for ya. 
