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I have just acquired this 51 Chieftain Deluxe 4dr sedan. I had went through and replaced the fuel lines, cleaned the tank, tore the 2bbl Carter carb apart also tore the non working fuel pump apart and cleaned both the carb and dual diaphragm pump. The oil in the car was super thin from gas getting into it somehow? The trans (original, not sure of the speed) wouldn't go into the higher gear all of the time (more not often than often). Motor purred like a cat up until I had pushed the motor a little to see if the shifting problem was vacuum related. Motor has picked up a knocking noise while under acceleration but goes away after shift. What could be the problem there? Rod, Valve, Lifter??? Trans just doesn't seem to want to shift to higher gear or over drive if there is. Is there a modulator valve or vacuum lines to control this trans? TV linkage seems to be fine with very little play. Any help would be greatly appreciated as there is very little information out there on either the Pontiac straight 8 or the early Hydra-Matic. Thank you in advance and thank you for accepting me into this forum.