I am having trouble with my older model car not shifting from 1st to 2nd. This happens after the first 7 miles when I'm driving. I had the transmission rebuilt. The kick-down linkage was missing and they replaced it with a kick-down cable. Two-speed powerglide and cast iron with a 283 Chevy engine. For the first 7 miles, it runs and shifts just fine. But then it will not shift into 2nd gear. If I rest the car for 10-15 minutes, then the car car starts fine and will drive for 7 more miles. This is a very slow way to get around! What is causing this shifting problem and what do I need to do to correct it?
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