With the supercharger, the 3.55's would be a better choice.
With my current combo + 10psi of intercooled boost = ~120-123 mph. In forth gear that will be some serious rpm's. 3.73's or 4.10s would be too much for me.
However, with the AOD and depending upon your tire diameter, the 3.73 or 4.10's may be better for you.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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