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Sorry to be the bearer of bad news but it is most likely the solenoids in the transmission on their way to pasture. I have been driving through traffic like you and the transmission will intermittently have harsh upshifts, sometimes up to 4 or 5 before shifting to the correct gear (down shifting never had a problem).

The transmission in mine finally set a code for the 'b' solenoid stuck closed :(

I don't believe it has anything to do with the braking at all, but I'm no mechanic. It was highly recommended that I use the lower gear (2nd) for the engine so the transmission does not shift (in traffic only of course) - this will extend the life of the transmission but not fix the problem. I was told that it is not worth the money to try and figure out what is wrong without a code (tons of money to troubleshoot and they may not find the problem).

Until the car sets a code just drive the car nicely, feel the rpms and let off the gas a little then reapply - this will help the transmission shift smoother and extend the life of the transmission (I drove mine for almost two years with the harsh upshift before the solenoid went kaput).

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Q: I have a 1999 Grand Prix GT and when stuck in traffic using the brake a lot or having to brake quickly the car begins to shift gears hard when moving again what is the problem?
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