transmission

700 would use less gas because it has overdrive.....it also have as a lower gear ratio in first gear
 
700's arent too beefy in stock form and if the detent is'nt adjusted right they won't live long.
 
is this a street truck or trail rig? what is the drievtrain setup of the vehicle? If larger tires and stock gears, it wont get good mileage either way... a 700 setup right will work better, but in stock form it may be a toss up
 
a 700 is a th350 with an OD sprocket on the back end and a better first gear, essentially.

There is not much strength difference between the two, other than the mentioned TV cable.
 
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