Car is 6 speed auto. when you let off brake it drifts back like a standard trans. does not always do it
6T40 does have a parking gear in it. If yours seem s not to engage, look at the shifter cable first. It could be stretched or where the cable latches to the mount could be broken. After that would be internal. Though I have never seen a part for the parking break.
Testimonial: "thanks,taking it to chev garage but wanted some idea first"
Automatic , have the fluid level in the transmission checked
run the fault codes
Testimonial: "thanks,I wondered about that myself,44,000 miles sealed trans.maybe that's it. taking it to Chevy garage Thur. thanks again !"
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