1973 Pontiac Sd 455 Trans Am Hydarmatic
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New engine and automatic transmissions codes accompanied the changeover to the second-type emissions system. A 2 was added to the existing transmission identification code to note the change. Production SD-455 engines for ’73 should have a Turbo 400 coded P2Q, but this PQ code is an early ’73 build. It’s likely the transmission originally installed at the same time as the SD-455. View Related Article
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