Original 1956 Pontiac Dealer Hydra-Matic Transmission Service Manual. This Shop Manual is what the Dealer used to service and repair the automatic transmission in your Pontiac. Part I covers the P-56 Strato-Flight Transmission and Part II of the Manual covers the D-56 Dual Range Hydra-Matic Transmission. It has information, specifications, adjustments, troubleshooting, procedures and illustrations to aid in repairing these Transmissions. It is in good condition for its age with normal wear, soiling and blemishing from use in a Dealership [see photos]. Very informative and useful tool for the Pontiac Owner.