This is found on Build sheets and Lynch Rd. fender tags. ENGINE / TRANSMISSION Code Number Description & Application 382 340 4BBL, manual trans., heater, 275hp 383 340 4BBL, manual trans., A/C, 275hp 407 426 Hemi, manual trans., heater, 425hp 408 426 Hemi, auto. trans., heater, 425hp 412 440 6BBL, manual trans., heater, 385hp 413 440 6BBL, auto. trans., heater, 385hp 418 383 4BBL, manual trans., heater, 300hp 419 383 4BBL, auto. trans., heater, 300hp 420 383 4BBL, auto. trans., A/C, 300hp 443 440 4BBL, manual trans., heater, 370hp 444 440 4BBL, auto. trans., heater, 370hp 445 440 4BBL, auto. trans., A/C, 370hp 451 340 4BBL, auto. trans., heater, 275hp 452 340 4BBL, auto. trans., A/C, 275hp REAR AXLE / BRAKES Code Number Description & Application 042 3.23 open, 8 3/4, 10" rear drum - front disc/LD drum 043 3.23 S/G, 8 3/4, 10" rear drum - front disc/LD drum 044 3.23 open, 8 3/4, 11" rear & front drums 045 3.23 S/G, 8 3/4, 11" rear & front drums 046 3.55 S/G, 8 3/4, 11" rear & front drums, (A36 Pkg) 047 3.55 S/G, 8 3/4, 10" rear drum - front disc, (A36 Pkg) 048 3.91 S/G, 8 3/4, 11" rear & front drums, (A31 Pkg) 049 3.91 S/G, 8 3/4, 10" rear drum - front disc, (A31 Pkg) 050 3.45 S/G, DANA 60, 11" rear & front drums, (A33 Pkg) 051 3.54 S/G, DANA 60, 10" rear drum - front disc, (A33 Pkg) 052 4.10 S/G, DANA 60, 10" rear drum - front disc, (A34 Pkg)