guessing like everyone else here but maybe a bad spark advance is showing itself in 3rd/4th more than the lower gears. Does the distributor move when you gas it?


1937 Chevy Pickup
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1952 Chevy Panel
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1950 Chevy Coupe
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I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile