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I'm just going to give you 2 things to think about...don't know if they'll help or not.
1) I have a 383 Chevy motor for my street rod with a CompCam 280 magnum. When I bought it, the guys at the CompCam said I had to have a torque convertor around 2600-2800 stall. I'm not sure if this is going to make any difference in your case.
2) I think you can adjust the shift points by turning a little screw inside the vacumm modulator. Unplug your vaccumm line into the vaccum modulator and use a small screwdriver to turn the screw clockwise or counterclockwise to adjust shift times.
I think you need to check your vaccumm line to the transmission. If there is a leak at all, your trans will not shift right...might not shift at all.
You might want to check to see that you are pulling vaccum off the right port to do so. I'm sure there are people on this board that might be able to say yea/nay on anything I just said. I just wanted to give you something to think about.
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