just picked up a 91 GT the otherday with one heck of a motor lol however the AOD in it is a POS and i really want to be shifting again so I'm debaing to get a TKO 600 or one of those ford 6 speed trannys and running a 4.10 gear which do you guys prefer? ill be running 26" tall tires, also what all is involved with swapping over a auto car to a manual?