Car Information:
Oldsmobile Silhoutte
Year: 2000
Engine Size: 3.8
Trans: Automatic

Issue / Question:
Vehicle has 92,000 miles.
Sometimes it shifts hard in every gear. I can turn it off for a few minutes, and drive it again and the trans will be smooth, no harshness in the shifting at all.
Could something be plugged??

Sounds like the electronic pressure sensor in the transmission is causing to much fluid pressure intermittently. I would be tempted to replace it if the system had no trouble codes stored.

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Magic Mechanic
1432 Lee Road OrlandoFL32804 USA 
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