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Originally Posted by RichMason
Acceleration is not an issue for me and I would gladly give up some around town speed for improved efficiency. For a few hundred bucks I could always switch back if I didn't like it I guess. Is there someone out there who can do the math for the best 65mph rear end to balance horsepower and torque?
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I believe the point is moot, Rich.
AFAIK, the tallest axle that you can put in the 123 would be the 2.88:1 from the 1985 vehicle. This would offer an engine speed of about 2600 at 65 mph. It also will limit your top speed to something like 70 mph.
With this axle, however, you could always shift down into third and run the vehicle at about 4000 rpm. This would provide ample power for an upgrade at speed. In fact, you might even get more speed from the vehicle in third gear at 4500 rpm than you can in fourth gear!