Ron, your 2.70 ratio is a calculated number I presume & you have arrived at that with an over driven set of spur gears with a 4.11 ring & pinion, that's a whole different animal & a lot more junk to go through than actually having a 2.70 ring & pinion.
How about one of the numerical whizzbangers on the forum show us some real numbers on what the difference is here because it defies logic to suggest a quick change could be more efficient in this situation?
Sid.