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In the belvedere. 500" 4L80 with .087 overdrive. 3800stall. I currently am runnong a 9" ford, 4.30 gears and a spool. I am going to build another third member with a posi unit for cruise night stuff. The spool eats up tires. Do not want to sacrifice all of my accelleration but with the torque it blows the tires off anyway. Tires are MT drag radials on 12" rims. 325/50/15s. 28" tall. I am thinking a 3.91, What would you guys suggest?

I saw in the spool post that you have 40 spline axles. I don't think there is any posi or locker for 40 spline axle so you are stuck with a spool unless you drop down to 35 spline axle to use a detroit locker.