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Re: OT- 2000 Chevy Truck Trans. (Brokenwrench can
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Posted by Allan In NE on January 30, 2007 at 00:57:15 from (148.78.243.25):
In Reply to: OT- 2000 Chevy Truck Trans. (Brokenwrench can you posted by Mike in Ind. on January 29, 2007 at 14:19:16:
Mike, Don’t think your dealer has never ran into this before because he is trying to lead you down a very expensive road and like Brokenwrench says, there simply is nothing wrong with your transmission. Think about it. The tranny isn't going to be defective and then somehow magically fix itself every morning only after the engine warms up. Have your favorite mechanic put his scan tool on the truck. Watch to see when it comes into loop. It shouldn’t take long; roughly 1 ½ to 2 minutes. If memory serves, in about ’99 or 2000, GM changed that threshold down from 151 to (I think) 95 degrees to lessen cold start emissions. Since that transmission defaults to second (both solenoids off), it will never upshift past second until the PCM gets off the chair and starts throwing commands. Don't know what engine/transmission you have, but there will be two temperature send switches. If you’re convinced that your thermostat is okay (not stuck open), I'd be for checking the small send switch with the multiple wires. That’s the boy that gives control over to the computers when the time is right. Not trying ot nose into your thread; just trying to help, Allan 
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