My set-up is a 389 Tri-Power, 700R4, and a 2200 stall locking torque converter.
The converter will not lock-up until I am in 4th gear and the manifold vacuum is 13 pounds or greater. I do have a kill switch in the lock-up circuit for the long uphill pulls. Without the kill switch when the engine is loaded, I get the unlock because the vacuum drops below 13, then as soon as unlocks the vacuum goes back up. The kill switch stops the dance. With a 27 inch tire that gives me a 2000 RPM at 70 MPH. Street the car drives fine, and I never get the electronic converter lock-up on the strip.
Oh yea, normal driving I do not get to 4th gear until 40 MPH or better.
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If you built it, drive it.
red 62 Tempest total stock restoration.
white 62 Tempest modified, 61 389 Tri-Power, and a conventional drive train.
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