"Where you find all the answers."
with T-45 Transmissions?
Borg Warner T-45 transmissions were only used behind
4.6L single and dual over head Mustangs from 1996 to
1999. TREMEC, in 2000, replaced the T-45 with
the TR-3650 which is very similar in design. The
T-45's design is very much like the T-56 six speed
transmissions. In fact the T-45 and T-56 share
many of the same parts. It has single rail
gear selector and carbon lined steel synchro rings
making it a smooth shifting transmission at high
rpm's. The gears are larger and stronger then
a T-5 and about the same as a TREMEC 3550 in
size. The T-45 is the first transmission in
the B/W -TREMEC lineup with a built-in bell housing
so it can not be exchanged. This limits the
T-45 to 4.6L mod motors as the bolt pattern is
different than the Windsor push rod motors.
T-45 from 1996-98 GT are different than the Cobra
Mustangs. The transmission mount point is moved
further back for the Cobras and as well as a 8 tooth
drive speedometer gear. Cobra T-45's are equipped
with a 7 tooth speedo gear. In 1999 all T-45's were
changed to the Cobra specs. Why this was not done
earlier is not understood.
T-45 shifters are the same as the T-5 shifter,
therefore, any aftermarket shifter will work on both
transmissions. Borg Warner WC T-5/T-45/T-56 all use ATF
oil or Synthetic ATF. No other oil should be used.
Redline MTL should not be used. Redline ATF is
fine. My recommendation is to use Amsoil ATF as I
have used it for years at the track with great
More TREMEC T-45
World Class T-5
84-93 T-5 V8 Bell Housing