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4R70W (70X10= 700 Lb-Ft torque)
4R75E (75X10= 750 Lb-Ft torque)
The 4R75E has greater torque capacity.
Oh i didnt realize we were talking about the numerical difference. I thought we were just talking about the E or W. In the 4R70 there were two different gear sets E and W, and when ford upgraded it to the 4R75 there was only one gear set available. That was my understanding of it anyway, even though i could be completely wrong. lol
The difference between the 4R70 and the 4R75 is the torque rating as blueoval already stated.