2.66 low gear vs close ratio

Here is a simple nut shell;

Wide ratio is a good street driver. Best over all for stock to an aggressive machine.
The close ratio is fine as well. Best if used in a serioous street machine or drag car. If it is use on a racing application, drag or road, then the close ratios lend well for keeping the engine/car in the perspective power band being used.
In a drag car or serious street performer, a set of 4.10's and closer ratio's allow fo the quick get up and go off the line into the power band where it can stay for the duration and change to the next gear to stay in the power band (lower half) where you would likely want it most.

The O.D. Best used for a truck, low gear ratio and Hwy. cruiser. It can be used with a low gear set (Like 3.23's and down) since it has the deep 3.09 first. So something like 3.55 and lower gears can actually feel a good bit better than the 2.66 ratio of the other trans. Ending in a .69 creates a heck of a tall gear for driving.

If you have time to sit down and calulate every ratio with your gear ratio and spread it out so you can see how every gear works with your gear ratio, then you can go further with tire sizes and RPM's of the engine.

It is a lot of work, but a greter knowledge and uderstanding you will have for a better choice for YOUR car and needs. A/J did a tone of writing. (My eyes hurt!) and the graph the followed helps a lot.