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Yeah Jerry, I got a lot more info on this from a couple of other forums as well as from some additional on-line research. Bottom-line, when the PCM is programmed such that it wants to see 195? as the engine coming up to full operating temperature, it means that anything less is still being looked at as part of the "warming up" cycle, so you're running more rich as well as a couple of other things that you wouldn't continue to want to be happening even though the engine would be at its new 180? operating temperature. The PCM would have no way of realizing the new "set point", so it would definitely be bad news over the long haul.
So, when I did the engine work on my TJ earlier in the year, I definitely went with a new Mopar 195? thermostat.
Thanks,
Don
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