known as Mercomatic and Cruisomatic
Was used 1951-68 in many Ford products.
In 1953 for a three month period, they were used in Cadillacs after
the Livonia, MI Hydramatic plant burnt to the ground.
It was also used in some International and Dodge trucks and Checker
Cabs. This was an hydraulically controlled rear wheel drive
transmission. It had a cast iron case and either an aluminum or
a cast iron bell
housing and/or extension housing.
(I've included two explanations about how these transmissions
worked. Both are by people that I highly respect for their
knowledge of older units, but they do vary slightly.)
1. When Ford first came out with an automatic transmission, it was
called a Ford-O-Matic. It was an iron case transmission. It started
off in second gear and shifted to third in the D position. You could
shift to L for first gear manually. In 1958, Ford started using a
sprag in the planetary and called the transmission a Cruise-O-Matic.
The D position next to neutral started off in second gear and made a
shift to third, just like a Ford-O-Matic, and you still had manual L
for first gear. But, using the sprag, there was another D position
(green dot) that started off in low, shifted to second, and shifted
to third, all automatically.
All of the Ford three speed transmissions used the Green dot-White dot
shift pattern until 1967 when they came out with the P-R-N-D-2-1 pattern
that was used from then until they quit making three speeds.
2. From 1951-57 it started in 2nd gear and shifted
to 3rd under "normal" driving conditions, but when accelerated hard,
it would start in 1st and then shift to 2nd and 3rd. Because of
this it was often considered a 2 speed transmission.
In 1958 the Cruisomatic was introduced and was a true 3 speed transmission,
however many Ford products continued to use the 2 speed Fordomatic
thru 1960. (Do not confuse the early Fordomatics with the later
aluminum case transmission that Ford called a two speed). The medium case version was also known as the Mercomatic and was produced from 1955-68. The large case version
was produced from 1958-65 and was MOSTLY used in Lincolns. In 1968 Ford came out with the FMX which
all 3 versions, but almost no parts interchange. Similar to Borg-Warner BW8
and BW12, but
few of the parts are interchangeable.
1968 was a cross-over year where the Cruisomatic was used in some
vehicles for part of the year before changing over to the FMX.
It is a little confusing, because Ford began calling MOST of their
transmissions Cruisomatic (including the FMX, C4, and C6).
I believe it was 1961 that Ford added a screw-in
vacuum modulator to these transmissions.
Rear cooler line is the cooler return
Intermediate = ¼" servo travel
Reverse = 1½
2.40:1 1st gear
1.47:1 2nd gear
Click the picture above to determine
WHICH version you have.
Click here to go to parts identification page
Parts Listed for Sale
(click on picture to enlarge)