In case anyone ever needs the answer to the above question or related information...the below URL refers you to the IMOA Board and the answers that were gathered from two other boards and posted there.-Answer(s) To MERC Duals Dilemma-
The FOM was air-cooled (wish I had a flat scanner to show you an illustration) instead of having an oil cooler. Fins on the torque convertor drew fresh air into a duct on the left side of the trans that would pass over the convertor cooling it (and the fluid) and then was discharged.
This duct stuck out pretty far and prevented duals from being installed. The solution is (was) to remove the intake tube (it faced rearward to prevent road debris ingestion) as there is a screen asm there at the case to prevent the sucking up of road kill.
FORD went to hydraulic cooling (cooling tank in radiator) with a running change in 1956. One could also get around the problem by installing a later FOM or preferably a CRUISE-O-MATIC.
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I am looking for information concerning factory performance/aftermarket speed parts (1958/1960) used on the MEL (Mercury-Edsel-Lincoln) (Also Thunderbird 59/60) Engine Series (383-410-430-462) produced from 1958 thru 1968.
Also older FORD Special Service Tools
-MEL Engine Forum-