DAVE I BELIEVE ITS A 2700 TO 3200, SO SOMEWHERE IN BETWEEN. I CHOSE THE LOWER STALL. I NEVER HEARD THAT ABOUT THE STALL CAUSING OVERHEATING. THIS IS MY FIRST GO AT A STALL. WHERE ARE YOU MOUNTING YOUR TRANS COOLER? RIGHT NOW WE ARE FAVORING KEEPING THE SAME REAR AND CHANGING THE GEAR TO A 373 OR 392 OR THERE ABOUTS. WE ARE CHECKING OUT GOING WITH A FLANGE AXLE. THE BACKING PLATE FROM 1960 TO 1964 SHOULD GIVE YOU THE E/BRAKE YOU ARE LOOKING FOR. THE 742 REAR IS WHAT WE ARE DEALING WITH. I BELIEVE IT IS FROM 1957 ON UP. IM NOT SURE WHAT YOURS IS.THERE IS A WEB http://www.autohobbydigest.com/8_75.html THIS MAY GIVE YOU SOME HELP. GGOD LUCK ON YOUR PRODJECT Fred 57 Dodge
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