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then what makes or desinates 055, mas cooling? Broadcast sheet? 440, with 4 sp,, is 055,, but what options make that override to 054? axle ratio? what package pkgs?

For sure the 4.10 DANA gets the 054, I have a photo of a '69 4-speed 4.10 ratio Dana with a 054 radiator that is original to the car and it is small font with a Lynch Road SPD of 1 29 (Jan 29, '69).

I would say the axle ratio and type/size is at or near the top of the radiator spec list, then A/C or trailer tow of course but after that I don't know I don't think that power brakes (disc front or 4-wheel drums) would require more or different cooling needs?? What else is there unless there is a "tropical" option that goes with the "heater delete" option????

(I'll probably learn something here again today like I do everyday on Moparts )


MikeR