Based on a 28" tall tire, 3.73 gears are a good all around gear. If you do more hyway driving, I go along with the other guys on that mid 3s gear. You will still have decent acceleration, but be able to cruise a little faster. as far as top speed, i have seen the 3.73s render the stock speedo totaly useless....crazyL 
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....
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