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Classic
Swaps
"Classic with modern
convenience"
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- Classic
Mustang
Five Speed Transmission Swaps
Swapping
a five speed transmission into an early Mustang,
Falcon, Cougar, or almost any early Ford could not be
any easier these days. Many of the five speed
transmissions found in late model Mustangs can be
installed with little modification. .
- 1965 - 66
Mustang
For a 1965 - 1966 Mustang we recommend a T-5
transmission for engines making under 450hp. The T-5 fits much better
than a larger TREMEC 3550 or TKO due to clearance
issues with the transmission tunnel. TREMEC
transmissions can be installed but it requires
modifying the transmission tunnel. A T5 swap in
these cars is straight forward whether swapping an
automatic or a Toploader. Even the inline-6
transmissions can be swapped with a T5. The only
modification needed to install a T-5 is to
clearance the right side of the shifter opening by
3/8".
Making over 450hp? There are now aftermarket T-5
gear sets that can handle up to 600hp! A T5 Swap
is now possible with these high horse power early
cars. Give us a call for more details.
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1967
- 73
Mustangs
1967
- 1973
Mustangs have all the same options as the 1965-66 Mustangs.
There are, however, additional five-speed
transmissions available from TREMEC. The
3550, and TKO models (only used available) and the new
TKO 500 and TKO 600.
These transmissions are larger and heavier than a T-5 or
four speed and require more transmission tunnel room
found in these larger cars. The TREMEC 3550 and TKO500
have the same bolt pattern as 3 or 4 speeds but have the
same longer 10 spline input shaft as the T-5. The reason
the input shaft is longer is to provide additional
clearance needed for the cable operated bellhousings
used in today's model Mustangs. Knowing this, we
offer shorten input shaft TREMEC's that will bolt up to
a stock 3 or 4 speed bellhousing without the use of an
adapter plate. This is the easiest approach when
replacing a dated 3 or 4 speed. Not using an
adapter plate also means there is no increase in the
overall length of the transmission so the drive shaft
length remains unchanged.
Shifter location on a TREMEC lines up with the opening in the floor
with a conventional long input shaft. With the
shortened input shaft the shifter is slightly forward
requireing a little more clearancing of the tunnel.
It is not recommended to use the shortened input shaft
with cars with consoles as the shifter is move too far
forward relative to the console.
Some of the additional parts needed to swap a 3550/TKO
into a 67-70, or 71-73 Mustang/Cougar is a TREMEC cross
member, as the mounting position is further back, a
shorter speedo
cable, speedo gear and shifter lever and ball.
For Mustangs
making more than 450hp, the TREMEC TKO and TKO600 is the
next step up with a 26 spline input shaft and a 31
spline output shaft. The overall layout is the
same and again with a shortened input shaft, the TKO can
be bolted to any small or big block early bellhousing.

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World Class T-5
84-93 T-5 V8 Bell Housing

65-66 Mustang Cable Kit

Mustang T5 Cross members
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