I am running a 4L80E with a 3.55 rear end. I feel it is a perfect street/strip combination. My motor has plenty of torque, so 3.55 is more than enough to get the car moving and it's relaxing on the highway. 70 MPH at 2400 RPM, with converter locked up.
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1968 Firebird - IAII 535 - FAST Sportsman - 4L80e - PTC 10" triple disc 3800 stall - Moser 12 bolt 3.55 - Caltracs - Hydraboost
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