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I'm not Jim G of course but I do build his transmissions so forgive me if I jump in on this. The Vigilante is a great performance converter but it is only 9.5 inches in diameter and in a heavy truck like the SSR builds quite a bit of heat. If you don't already have one, then invest in an auxillary trans cooler. Mike in AZ sells a nice kit that is easy to install and runs in tandem with the factory cooler. The temerature of 200 degrees on the highway is a bit warm since this is the time when the converter clutch should be on and keeping slippage at a minimum. The 2006 computer will always allow a little slippage in it's stock settings but a good tuner can turn this into an "on and off" lockup and get rid of the partial lockup which will help control heat. I would be more comfortable with temps at 185 or less. Let me know if I can help.
Greg
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