727 Lower Gear Set for street/highway use

TT5.9mag said

All of the torqueflights are 1:1 in third. Your highway cruising rpm will not change with the lower first gear set. Listen carefully, if you want the benefit of deep starting gears AND highway cruising, put some kind of overdrive transmission in it. Period. The amount of work it takes to install one is not terribly difficult and it’s always worth it.

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You are right about the cruising speed RPM, I should have worded that in a better manner. What I was getting at is that you can run a higher rear gear (say 2.94 vs. 3.23), getting lower cruising speed RPM, and still have a decent low end gear set/torque to start.

All of the OD options I have read about require significant frame changes, can't see doing that personally. The GV overdrive gearset is expensive and photos of the installation shows a fair amount of floorpan changes.

I hear what you are saying, just trying to minimize the fabrication and cost impacts. Maybe it's just not possible without going that path, at which point I might simply forego highway driving and leave it as a street car