Yes I have a 2001 ford f 150 lariat 5.4l 4x4 it has a RP-F7AP-700s in it . I found a RFF81P-7006-AA. Will it fix!??

 

Nope - you have a 4R70W and you found a E4OD/4R100. Not interchangeable.

You need a 4R70W out of a 4WD 4.6 or 5.4 V8 F-150 from 1999 through 2003, the later the better.

 

Better also add that he has to have the 4r70w flywheel as well as the flywheel off an E40D/4R100 will bind the torque converter in a 4r70w. They have more throw towards the torque convertor than the 4r70w does. For those that don't know.

 

Being that he has a 4R70W now, the flywheel is a 4R70 style. He asked if he can swap a 4R100 into it, and that answer is no, period, unless substantial mods are done.

 

Yep, a lot of mod to place that transmission in. Had my glasses off reading that. You know how old people are read without our glasses.