Q: I have a 66 Impala. I end up changing the tranny out for a 350 turbo. The car runs but it won't pass 15 mph.

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I have a 1966 Impala with a rebuilt 350 turbo transmission.The car turn on but when I try to go out for a spin the car doesn't want to pass 15 mph. wondering if anybody might know the problem? Please let me know, thank you.

My car has 20 miles.
My car has an automatic transmission.

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