Reply to "changing fifth gear to a taller ratio"

1887, be aware that the 6-speed ZF, developed for Ford's GT but then not chosen, is indeed available from RBT Transmissions- at least two are in U.S Panteras. The cost is less than the gigantic Ricardo trans that was chosen for the Ford GT, and uses the same cases as original with a 4" extension to house the new 6th gear. The shifter works unaltered, the bell housing and trans mounts fit as-stock and the only known mod is a small notch needs to be cut or bent up on the A/C shroud bottom (if its still in back on your car; many have been moved to a more efficient front mount) to clear the slightly longer cases. Lloyd at RBT could tell you if the 6th gear could be installed in your ZF, or what if any "trade-in" value your ZF has with him on the upgrade. FAX is the best way of contacting him.