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07-15-2006 #2
The 700-R4 and 4L60 are the same transmission. The 4L60E is electronically controlled and needs a computer, but otherwise it is the same as the 4L60/700-R4.
For your power level you will be fine with your 700-R4.
The 4L80E only comes in the electronically controlled version. (Actually, that's not completely accurate, there is an aftermarket company making them with a manual valvebody.)
It is a bigger, heavier transmission and has more drag, so it's usually not recommended for use until your power levels require it. Of course, if you are thinking toward the future, when you'll have an engine making 700 hp then maybe it's worth it to you.
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