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They are supposed to do that with the stock tune. The pcm unlocks the torque converter when You let off the throttle a little to prevent what it perceives as un wanted engine braking to help with fuel economy. Mine does it alot around 50-60mph. Especially with the cruise on. I also just installed a 2800 stall and now it drives me crazy. I'm hoping it can be eliminated with efi liive. I installed my cam heads longtubes and injectors last weekend and should be getting a dyno tune this weekend. Ill let you know for sure if it can be tuned out.
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This happened to me once and it turned out really bad. The place that built my trans didn't replace two very important solenoids. There's a pressure solenoid and a Pressure Control Manifold. One controls pressure and one controls where it goes (apparently). The pressure solenoid is the round one, under the pan, right by the accumulator that you can see, and the PCM (pressure control manifold) is the flat one that is bolted to the valve body. If one or both of those are gunked up inside your trans won't pressure up and the converter won't stay locked.
Last edited by EmmerichLSx; 11-23-2010 at 01:51 AM.
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