I saw Troy K’s thread on the 2004 4R75E transmission – since this is going to be a sealed transmission – what do you think about sealed transmissions? Can a fluid be good enough to last and protect going over a hundred thousand miles without causing harm to the transmission? What is a lifetime, as in lifetime fluid?

This is what Pickuptruck.com had to say: To complement the engine choices, the F-150 will be using the a new 4R75E automatic transmission, which is an evolution of the 4R70E currently on the ’03 model. The tranny needed to be upgraded to handle the extra torque of the new 5.4-liter, and features a redesigned torque converter, turbine speed sensor, increased microprocessor speed, and “smart” shift technology that learns the driver’s patterns and applies the shift points accordingly. The transmission case is sealed, so the fluid is lifetime and maintenance free.

http://www.pickuptruck.com/html/auto...ord/f1506.html