.
@Stan Galat posted:....In the case of the mighty, mighty Northstar 4.6 L V8 limo, there's less torque on hand than the trailer and extra 4 ft in the middle requires...
I think aerodynamic drag from the presidential fender flags is making the critical difference.
The 4T80E transmission was designed to handle the form factor of a standard presidential limo trailing a standard presidential auxiliary vehicle.
Once you add the flag package, the stock cooling can't keep up. Most embassy staffs that mount flags add an external tranny cooler with thermostatically-actuated fan in the rear driver's side wheel well.
.