Ballpark ..what is the rear gear ratio dropped to in OD with 4:11 rear, I know the tire diameter fits into the equation, just looking for ballpark figure.
OD could be between .62 and maybe .78,
so 4.11s, could cruise at between 2.55 to 3.21.
With 27 inch tires this translates to 65= between 2600 and 2065rpm.
best I can do