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Unit Identification, Motorcoach Division As taken from a CROWN Service & Parts Catalog . . . All vehicles manufactured by the Motor Coach Division of Crown Coach Corporation have a Vehicle Record plate in the drivers compartment on the dash panel, centered. The information on the plate is needed in registering the vehicle for licensing purposes and for ordering replacement parts. The following section will give a brief idea on how the make/model numbers were assigned on Crown Supercoaches. The number in the upper left box is the Make or Model Number. 2AD-743-11-1.5AC This group of numbers and letters indicates the engine location, number of rear axles or if engine is diesel (School Coaches did not use the "D" in their make/model number). The various possibilities are: 2 - Tandem rear axle F - Front engine A - Amidship engine R - Rear engine D - Diesel engine 2AD-743-11-1.5AC This group of numbers and letters indicates the engine. The various possibilities include: 534 - 534 SD Ford 450 - RD 450 International Harvester 501 - RD 501 International Harvester 549 - V-8 549 International Harvester 504 - 504 GH Hall Scott 590 - 590 GH Hall Scott 779 - 779 GH Hall Scott 190 - 190 Hall Scott 588 - V 200 Cummins 505 - Cummins 8.3 672 - NHH 195 Cummins 743 - NHH 220 Cummins 743T - NHHT 220 Cummins 855 - NHH 250 Cummins 8V71 - 8V71 GMC 568 - 8V71 Detroit Diesel 552 - 6V92 Detroit Diesel 426 - 671 Detroit Diesel 2AD-743-11-1.5AC This group of numbers indicates the tire size. The various possibilities include: 10 - 10.00 X 20 or 22 Tires 11 - 11.00 X 20 or 22 Tires 12 - 12.00 X 20 or 22 Tires 12 - 12.00 X 22.5 Tires 2AD-743-11-1.5AC This group of numbers and letters indicates body variations. The various possibilities are: 1.5 - Split level floor (Crown Custom Coaches - not School Coaches) AC - Air Conditioning