actually the c6 was the hipo replacement for the fmx which had a habit of
cracking the center support under high HP and abuse. The c6 is well built
for the most part. Just be sure to get all the upgrades. and if your
looking for a manual a five speed aftermarket is my choice. For more in
depth discussion go to alt.hi-po.big-block-ford-mercury the engine and
drive train is on topic also. KB
ThunderSnake #9 Warn once, shoot twice
460 in the pkup, 460 on the stand for another pkup
If your top priority is performance, a built C4 is the way
to go. It is not not as strong as a C6 all else being
The FMX will get the job done with the exception of weight
as it is a cast iron case. The FMX is strong but, can be
expensive to build because they typically grenade when they
fail. Parts and someone who can "build" one can be hard to
find around here.
IMHO, if you don't mind a small performance hit, the C6 is
the way to go especially on the street. It is readily
available since it was used up thru the '96 year model in
some trucks. Several trans builders and suppliers like
Summitt Racing have them complete ready-2-run.
Whichever trans you use, make sure you use a converter with
a proper stall speed for your engine buildup and vehicle
config. The right converter can make all the difference.
The higher the stall, the more cooling you will need on the
street. Stall too high, you are wasting RPM - stall to low
and your slow off the line. If you are circle tracking,
it's another game.
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