i have a 95 f150 4x4 and have some quesitons about the tranny

i know absolutely nothing about transmissions, i did install a deep sump pan and trans go shift kit long ago but that was as far as my trans skills will go, it does have around 300k miles on it and still seems fine but im sure its just a matter of time.
how much power can the stock e4od handle?
is there anything in the transmission that limits power to the wheels? I remember reading that getting the truck to go over 100mph will need modification? again, this was something i read a long time ago and did not know if this is a myth or not.
is there anything that i can do to apply power to the wheels better? this truck has always seemed to rev higher to get moving than any other f150 ive driven, ive owned it since it was new and is the original trans. maybe its just me.
what is the factory stall for a 4x4 e4od different between the 2wd and 4wd trans?