All .75 fifth gears fit a 4k?

[amalventano1 at tds.net (Allyn)]

0.75 on a 4k final drive (3.94) should be just fine.  A N/A 2.0 16v can do just fine even with an FN 5th  (0.71 on 3.89 FD).  Where
it gets questionable is where you take a really wide FD (3.67) and couple it with a 0.71 5th.  I ran some simulations where 2 16v
turbos (assuming 500 hp) barely squeaked through the 80-100mph in that wide of a gear - this was because speed was too high with
respect to the engine, which was barely into its powerband.  If the sim was correct, that wide of a gear would barely hold highway
speed in a car of lesser power, and would require frequent downshifts any time you hit a hill or tried to pass at speed.  For what
its worth, that wide combo is one of the few possible ways to get a twin 16v turbo to theoretically hit 160 mph before exceeding
7200 rpm.

hth
Al