I saw 4200 Miles here -- but I just noticed after reading your post that those with some auxiliary tanks.
http://www.prestige.mc/monaco/727jet.htm They are selling 727-s as exec planes.
This truly exceptional aircraft is equipped with winglets and the Stage 3 FedEx Hush-kit. The aircraft has been recently fitted with the newest generation Auxiliary Fuel Tanks for extended range and performance.
The winglets and auxiliary tanks offer the following performance enhancements:
7% shorter runway length
8% shorter time to altitude
7% less fuel burn
4200 mile range with IFR reserves
Yes, but no whirlpool...