I would go with atleast a 3.73. With the .67 5th gear, you will not even feel the 3.73's. Your cruising rpms depending on your tire hfight should be around 1700-1800rpms. Your gas milage will still be very good, with the fun of the 3.73. Actually, your gas milage will be better than with a 3.50 3 speed auto. You could even go with a lower gear and still have better gas milage when you use a 5 speed.
Rwhite65 fastback mustang, 306, 4.10, aod
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