My 2004 Chevy Impala Speedometer and transmission acts weird after parking on incline.?

Jocho

New member
I drove into my In Laws driveway (which is very steep) I left my car running for about 10 - 15 minutes and when I left my car shifted very hard between gears (automatic trans.) and my speedometer said I was going 50 MPH when I was really going 25 MPH. When I got home and turned my car off, the speedometer still read 10 MPH. I was able to reset the speedometer by turning the key but not starting the car... What's going on? and does it have anything to do with parking on the incline?
 
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