Any one have any thoughts on a 53 chevy grinding metal noise after switching into 3rd gear. Pulled off to the side of the road literally on the nm co border. Waiting on tow truck. Trying to brainstorm. I see no oil. No smoke at time of incidence. Coolent cap is still hot but he level was fine when we left about 15 miles back. filled gas tank just before colorado border. pulled out of parking lot and less than 2 miles, metal grinding noise. Any thoughts. sucks.