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« on: September 07, 2017, 06:11:37 PM »
The information you provided is not terribly specific, you'd be better off posting up the data plate. Someone here could probably decode it and tell you a lot more information. I'll take a stab at helping you but this information is only as good as "...66 LTD with a 352 and a automatic...," my available specs, and my memory.
The 352 in that year/model was a 2 barrel.
The transmission was usually Cruise-O-Matic MX/FX (I think it's the one we used to refer to as an FMX) which is the cast iron case with a separate bellhousing. A C-6 was available as an option (whether it was available with a 352 and/or part of a towing package, I don't know).
You asked about towing packages, unless you can identify a specific part that's unique to the package, find a build sheet in the car, or an original invoice we may never know. Towing packages back then were usually stiffer springs, a heavier radiator, and (maybe) a bigger alternator. I don't know the specs on that particular car but limited slip diffs were not the norm in 1966 except for high performance variants.