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Message: [QUOTE="Mark Kovalsky, post: 776961, member: 1654"] What is happening is that you don't have enough information to be able to tune the trans. When I tuned transmissions for a living at Ford I had instrumented transmissions. We added pressure transducers in each hydraulic circuit feeding each clutch. We also had the driveshaft instrumented so I had an output torque signal. These were plotted in a computer program so that I could understand what was happening during a shift. This trans isn't like a 4R100 where you could just apply the next clutch and make the shift. You could apply the oncoming clutch VERY fast and all you would get is a firm shift. That won't work in a 6R140. This trans has synchronous shifts. You don't just apply a clutch, you must release the previous clutch as the oncoming clutch is applied. How does your software allow you to control the releasing clutch as it is controlling the oncoming clutch? If you can't control both clutches at the same time you CANNOT make this shift work right. You can, however, destroy some clutches trying to make it happen. The offgoing/oncoming clutches must be synchronized to each complete what they are doing within 0.030 seconds of each other or you get a flair (torque goes to zero and RPM increases) or tie up (output shaft torque goes VERY far negative and RPM drops.) If you don't have a torque signal to be able to see if there is flair or tie up then I wouldn't know how to tune the trans. I only tuned transmissions full time for 19 years. I have some experience doing this. This trans, and the 5R110 before it, are so complicated that without the instrumentation I mentioned above I doubt that anyone can develop any aftermarket shift software for this trans. And I don't think the tuner companies have the money to invest in this. The instrumentation parts are very expensive, and took many, many manhours to install and maintain. [/QUOTE]