Torque Converter Clutch (TCC) Issue

I have a 95 1500 Suburban. Everytime that I get on the freeway for a period longer than 10 minutes, my "Service Engine" light comes on due
to the TCC having problems (at least that is what the codes say). I've read in other postings and on various internet sites that this is due to a lack of fluid pressure not allowing the TCC to engage. I've also read that the unit not engaging does not cause any damage to the transmission, just causes the gas mileage to decrease. I've had my transmission inspected at 3 shops, all with the same diagnosis, rebuild (for additional reason besides the TCC). My question now is between the time I get it rebuilt (next couple of weeks) and now, will I cause any damage to the vehicle by driving it with the TCC not engaging correctly? Will freeway driving for any extended period of time (2-3 hours) cause any more damage than bad gas mileage?
Thanks, Ethan
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code P-1870
if you let it continue, it WILL toast the clutch lining in the TC
which will go to pieces, and plug up the return flow from the converter, which is the lubrication circuit to the gear train

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So what's the fix? Replacing the pump in the tranny or the TCC solenoid?
On Tue, 12 Aug 2003 17:25:19 GMT, "Gary Glaenzer"

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neither (the pump or the solenoid)
the problem is wear in the valve body bore that houses the Torque Converter Regulator valve
GM says 'replace valve body @ 750-800 bucks'
I ream the offending bore and use a stelle valve in a steel sleeve, costs about $ 350 total

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