Why does my 1957Chevy transmission not shift from 1st to 2nd after 7 miles?
My transmission was rebuilt. The kick down linkage was missing and it was replaced with a kick down cable. It is a two speed power glide, cast iron with a 283 Chevy engine. It runs and shifts good for the first 7 miles, then will not shift to second gear. 10 to 15 minute cool down-starts to work again for 7 miles.