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Re: Transmission or TPS
It sure could be a TPS issue. On electronic transmissions, the computer uses the inputs from the TPS to adjust line pressure in the transmission. The TPS takes the place of the TV cable in the older hydraulically controlled transmissions. If that TPS is spiking high its telling the computer that you are pressing on the accelerator which automatically increases line pressure which would in turn cause harsh shifting. Fix the TPS problem and your transmission problem should go away.
Let us know what happens.
transman
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GM MASTER TECHNICIAN
SR. TRANSMISSION BUILDER
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