ENGINE SERIAL NUMBER AND SUPFIX CHART Model Description Desfgyrrtaion C10 20 30 R Thriftmaster 235 i A 4 J C10 20 30 A Thrittmaster 235 with Powerglide i A 4 JB ClO 20 30 40 K10 20 4 Thrittmaster 235 with H D Clutch i t 4 JC C10 20 30 40 K10 20 4 Thriftmaster 235 with Powerglide and H D Clutch 4 JD P20 3O 4 4 Thrittmaster Special 235 t t tt i K P20 3O i t i Thrittmaster Special 235 with Hydramatic KA C50 L50 S5O i4 4 Thrittmaster 235 p t c 4 L C6D L60 S60 Jobmaster 261 Ccc 4 4 LB C60 L60 4tt Jobmaster 261 with A O H B t t c LD C60 L60 S60 it Jobmaster 261 with Power Steering LE C60 L60 S60 trre t Jobmaster 261 with Powermatic r t A LJ C60 L60 S60 r Jobmaster 261 with Powermatic and Power Steering LK LBO rt r r r Jobmaster 261 with Powermatic and A O H B LM C10 20 30 40 K10 2D t Trademaster 283 t r t r M C10 20 Trademaster 283 with Powerglide rr r MA L5O r r Trademaster 283 r r r N L6O rr rr Taskmaster 283 rr r rr r r NA L60 r Taskmaster 283 with A O H B r r r r r r r r NB C60 S60 t t t r Taskmaster 283 with Powermatic r t r Lr NE C60 Taskmaster 283 with Powermatic and A O H B t r NF LBO r r Taskmaster 283 with Powermatic r NG LGO L r Taskmaster 283 with Powermatic and A O H B NH C50 S50 Trademaster 283 r r t P C60 S60 r r t r r Taskmaster 283 r t r r PA C60 e r Taskmaster 283 with A O H B r r PD C70 80 L70 80 M70 S70 Workmaster 348 r t r r T C70 80 L70 80 M70 S70 r Workmaster 348 with Powermatic t r r r TD Engines are stamped with a source production date and type serial pad EXAMPLE TOIOIJ T 01 01 J Tonawanda Month Day Thriftmaster 235 Plant January First Models C10 20 30 1959 4 G i m az i ii2