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Original Message
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| FX and FMX are small box trannys, MX is a big box. |
| By Dave Shoe - 02/02/2002 12:06:26 AM; IP 216.243.158.113 |
First off, the acronyms FX and MX were invented in 1966 to describe a tranny which had been around since 1958. The acronym apparently designated the case size of the Cruisomatic (Ford), Mercomatic (Mercury), TurboDrive(Lincoln) tranny. These three trade names all represent the same basic tranny.
(Be aware: As usual most of this is BS, but some is newly found documented info).
The two tranny sizes had been around since 1958, but no distinction other than Cruisomatic, Mercomatic, and Turbodrive was deemed necessary until some writers found themselves with spare time at the end of 1965 and decided to rewrite a chapter in a shop manual for yuks. The FX was most often found in Fords, and sometimes in Mercurys. The MX frequently in Lincolns and Mercurys, and sometimes in Fords. They are distinguishable by the case size and shape, and in particular, the pan gaskets are slightly different.
In 1968, the FX was apparently replaced by the FMX. I suspect this means the pan gasket changed a little, as not much else did. The MX gasket remained the same.
I've found a 1968 Ford "registered technician" book which reads as follows:
Both the cast-iron case Cruise-O-Matic "big box" (designated MX) and "small box" (designated FMX) use the same basic control valve body and <snip>
Later, the book goes on to state:
"Small box" Gear Train Change Details: In the cast-iron case "small box" (FMX) transmission, most gear train components are dimensionally the same as last year's FX design. However, clutch pack clearances are adjustable for both the forward and reverse-ans-high clutches. PHA models have four friction plates and three steel plates in the forward clutch, while PHB models have five friction plates and four steel plates in the forward clutch.<snip>
I'd scan some of this, but my scanner broke.
Shoe.
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