what 4 speed? the original for your AD?
pros: none .... unless you need a real low 1st gear or prefer a floor shift
cons: lotsa fuss for no gain whatever, and ya gotta find the right floor cover for it or cut a good size hole in the 3spd one

if you're looking for a better high gear, note that they both have 1:1 top ratio

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics