What do my Chevrolet "Series" and "Model" Codes Mean -- A Stovebolt Tech Tip

	What do my Chevrolet 'Series' & 'Model' codes mean?
By John Milliman
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'29-'59 Series Names
'29	*"International"*
'30	"Universal"
'31	"Independence"
'32	*"Confederate"*
'33	*"Eagle/Master Eagle"*
'44-'46	*"Victory"*
'47-'54	*"Advance Design"*
'55-'59	*"Task Force"*
'60-'66
'67-'72
'73-'87	*"Rounded Line"*

Decoding your truck's Vehicle Identification Number can be like breaking the German submarine code of World War Two. And one of the most elusive elements can be the "Model/Series" code. A 2-letter alpha-numeric on the 1948 and earlier trucks, and both a 2-letter alpha and a 4-digit numeric designator on the '49 - '59 trucks, the Model/Series code is a powerful tool that will tell you the year and size of your truck. Here's a table of the ones I've researched so far. I need and welcome any additions. If you know any missing from the table below, please email them to me and I'll add them to the table.
Thanks to Mike Boteler (Mike's Garage) for the information on the '55-2nd series through '59.

Year	Model/ Series	Wheel Base (Inches)	Size
1929	AC LR	107 131	1/2-ton 1.5-ton
1930	AD LR LS	107 131 131	1/2-ton 1.5-ton (1st Half) 1.5-ton (2nd Half)
1931	AE LT MA MB MC MD	109 131/157 131 131 157 157	1/2-ton 1.5-ton (Single & Dual Wheels, 1st Half) 1.5-ton (Single & Dual Wheels, 2nd Half) 1.5-ton (Dual Wheels, 2nd Half) 1.5-ton (Single Wheels, 2nd Half) 1.5-ton (Dual Wheels, 2nd Half)
1932	BB NA NB NC ND	109 131 131 157 157	1/2-ton 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels)
1933	CB OA OB OC OD	109 131 131 157 157	1/2-ton 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels)
1934	DB PA PB PC PD	112 131 131 157 157	1/2-ton 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels)
1935	EB QA QB QC QD	112 131 131 157 157	1/2-ton 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels)
1936	FB RA RB RC RD	112 131 131 157 157	1/2-ton 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels)
1937	GC GD GE SA SB SC SD	112 122.25 122.25 131.5 131.5 157 157	1/2-ton 3/4-ton 1-ton 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels)
1938	HC HD HE TA TB TC TD	112 122.25 122.25 131.5 131.5 157 157	1/2-ton 3/4-ton 1-ton 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels)
1939	JC JD JE VA VB VC VD VE VF VG VH VM VN	113.5 123.75 123.75 133 133 158.5 158.5 107 107 131 131 156 156	1/2-ton 3/4-ton 3/4-ton (Heavy Duty) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) 1.5-ton (Single Wheels) 1.5-ton (Dual Wheels) COE (Single Wheels) COE (Dual Wheels) COE (Single Wheels) COE (Dual Wheels) COE (Single Wheels) COE (Dual Wheels)
1940	KC KD KE KF WA WB WC WD WE WF	113.5 123.75 123.75 133 133 158.5 193 107 131 156	1/2-ton 3/4-ton (11-Inch Brakes) 3/4-ton (14-Inch Brakes) 1-ton 1.5-ton (Single or Dual Wheels) 1.5-ton (Single or Dual Wheels) Schoolbus (Dual Wheels) COE COE COE
1941	AK AL AM AN YR YS YT YU YV YW	115 125.25 125.25 134.5 134.5 160 195 109 132.5 158	1/2-ton 3/4-ton (11-Inch Brakes) 3/4-ton (HD, 14-Inch Brakes) 1-ton 1.5-ton (Single or Dual Wheels) 1.5-ton (Single or Dual Wheels) Schoolbus (Dual Wheels) COE COE COE
1942 (early)	BK BL BM BN MR MS MY MT MU MV MW	115 125.25 125.25 134.5 134.5 160 160 195 109 132.5 158	1/2-ton 3/4-ton (11-Inch Brakes) 3/4-ton (HD, 14-Inch Brakes) 1-ton 1.5-ton (Single or Dual Wheels) 1.5-ton (Single or Dual Wheels) Schoolbus Chassis Schoolbus Chassis COE COE COE
'42-'43	War Production
1944-'45	BK BL BM BN		1/2-ton 3/4-ton 3/4-ton w/HD chassis 1-ton panel
1946 (Interim Series)	CK CL CM OR OS OW OY OE OF OG OM ON OP	115 125.25 134.5 134.5 160 160 195 134.5 160 195 109 132.5 158	1/2-ton 3/4-ton 1-ton 1.5-ton 1.5-ton School Bus Chassis School Bus Chassis 2-ton 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE
1946 (Late Series)	DP DR DS PJ PK PL ** PV PW PX PP PR PS	115 125.25 134.5 134.5 160 160 195 134.5 160 195 109 132.5 158	1/2-ton 3/4-ton 1-ton 1.5-ton 1.5-ton School Bus Chassis School Bus Chassis 2-ton 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE
1947	EP ER ES QJ QK QL QV QW QX QP QR QS	116 125.25 137 137 161 161 137 161 199 110 134 158	1/2-ton 3/4-ton 1-ton 1.5-ton 1.5-ton School Bus Chassis 2-ton 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE
1948	FP FR FT FS FU RJ RK RL RV RW RX RP RR RS	116 125.25 125.25 137 137 137 161 161 137 161 199 110 134 158	1/2-ton 3/4-ton 3/4-ton Forward Control Chassis 1-ton 1-ton Forward Control Chassis 1.5-ton 1.5-ton School Bus Chassis 2-ton 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE

Year	Model	Series	Wheel Base	Size
1949	GP GR GT GS GU SJ SK SL SV SW SX SP SR SS	3100 3600 3700 3800 3900 4100 4400 4500 6100 6400 6700 5100 5400 5700	116 125.25 125.25 137 137 137 161 161 137 161 199 110 134 158	1/2-ton 3/4-ton 3/4-ton Forward Control Chassis 1-ton 1-ton Forward Control Chassis 1.5-ton 1.5-ton School Bus Chassis 2-ton 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE
1950	HP HR HT HS HU TJ TK TL TV TW TY TX TP TR TS	3100 3600 3700 3800 3900 4100 4400 4500 6100 6400 6500 6700 5100 5400 5700	116 125.25 125.25 137 137 137 161 161 137 161 179 199 110 134 158	1/2-ton 3/4-ton 3/4-ton Forward Control Chassis 1-ton 1-ton Forward Control Chassis 1.5-ton 1.5-ton School Bus Chassis 2-ton 2-ton 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE
1951	JP JR JT JS JU UJ UK UL UV UW UY UX UP UR US	3100 3600 3700 3800 3900 4100 4400 4500 6100 6400 6500 6700 5100 5400 5700	116 125.25 125.25 137 137 137 161 161 137 161 179 199 110 134 158	1/2-ton 3/4-ton 3/4-ton Forward Control Chassis 1-ton 1-ton Forward Control Chassis 1.5-ton 1.5-ton School Bus Chassis 2-ton 2-ton 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE
1952	KP KR KT KS KU VJ VK VL VV VW VY VX VZ VP VR VS	3100 3600 3700 3800 3900 4100 4400 4500 6100 6400 6500 6700 6800 5100 5400 5700	116 125.25 125.25 137 137 137 161 161 137 161 179 199 212 110 134 158	1/2-ton 3/4-ton 3/4-ton Forward Control Chassis 1-ton 1-ton Forward Control Chassis 1.5-ton 1.5-ton 1.5-ton School Bus Chassis 2-ton 2-ton 2-ton 2-ton School Bus Chassis 2-ton School Bus Chassis 2-ton COE 2-ton COE 2-ton COE
1953 - 1955 1st Series	H J K L M N P R S T U V W X Y Z	3100 3600 3700 3800 3900 4100 4400 4500 5100 5400 5700 6100 6400 6500 6700 6800	116 125.25 125.25 137 137 137 161 161 110 134 158 137 161 179 199 212	Commercial -- 1/2-ton truck Commercial -- 3/4-ton truck Commercial -- 3/4-ton truck Forward Control Chassis Commercial --1-ton truck Commercial --1-ton truck Forward Control Chassis Utility -- 1.5-ton truck Utility -- 1.5-ton truck Utility -- School Bus Chassis Utility -- 2-ton COE Utility -- 2-ton COE Utility -- 2-ton COE Utility -- 2-ton truck Utility -- 2-ton truck Utility -- 2-ton truck Utility -- School Bus Chassis Utility -- School Bus Chassis
1955 2nd Series	H M F G J K L N P R S T U V W X Y Z SS ST SU SV SW SX	3100 3200 3400 3500 3600 3700 3800 4100 4400 4500 5100 5400 5700 6100 6400 6500 6700 6800 5100S 5400S 5700S 6100S 6400S 6500S	114 123.2 104 125 123.2 137 135 130 154 128.2 112.6 136.6 160.6 130 154 172 194 220 112.6 136.6 160.6 130 154 172	XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX
Series # with "S" = "Special Model" Series 31-3200 = Light Duty Series 34-35-36-37-3800 = Medium Duty Series 40-50-60 = Heavy Duty
Year	Model	Series	Wheel Base	Size
1956	3A 3B 3C 3D 3E 3F 3G 4A 4B 4C 5A 5B 5C 5D 5E 5F 6A 6B 6C 6D 6E 6F 6G 6H 7A 7B 7C 8A 8B 8C 8D 8E 8F 9A 9B 9C 10A 10B 10C 10D 10E 10F	3100 3200 3400 3500 3600 3700 3800 4100 4400 4500 5100 5400 5700 5100S 5400S 5700S 6100 6400 6500 6702 6800 6100S 6400S 6500S 7100 7200 7700 8100 8200 8400* 8500* 8700* 8800 9100 9200 9700 10100 10200 10400* 10500* 10700* 10800	114 123.2 104 125 123.2 137 135 130 154 154 112.6 136.6 160.6 112 136.6 160.6 130 154 172 194 220 130 154 172 112 124 172 132.5 144.5 154.5 174.5 192.5 240 112 124 172 132.5 144.5 156.5 174.5 192.5 240	XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXX
Series # with "S" = "Special Model" * = Optional Tandem Axle Equipment Series 3000 = Light Duty Series 4000, 5000, 6000, 6000S & 6000H = Medium Duty Series 7000, 8000, 9000 & 10000 = Heavy Duty
1957	3A 3B 3C 3D 3E 3F 3G 4A 4B 4C 5A 5B 5C 5D 5E 5F 5G 5H 5J 6A 6B 6C 6D 6E 6F 6G 6H 6J 6K 6L 6M 6N 7A 7B 7C 8A 8B 8C 8D 8E 8F 9A 9B 9C 10A 10B 10C 10D 10E 10F	3100 3200 3400 3500 3600 3700 3800 4100 4400 4500 5100 5400 5700 5100S 5400S 5700S 5100H 5400H 5700H 6100 6400 6500 6702 6800 6100S 6400S 6500S 6200 6200 6100H 6400H 6500H 7100 7200 7700 8100 8200 8400* 8500* 8700* 8800 9100 9200 9700 10100 10200 10400* 10500* 10700* 10800	114 123.2 104 125 123.2 137 135 132.5 156.5 156 112.6 136.6 160.6 112.6 136.6 160.6 112.6 136.6 160.6 132.5 156.5 174.5 196.5 222.2 132.5 156.5 174.5 129.6 153.6 132.5 156.5 174.5 112 124 172 132.5 144.5 154.5 174.5 192.5 240 112 124 172 132.5 144.5 156.5 174.5 192.5 240	XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXXXXX XXX XXX XXX XXX XXX XXX XXXXXX XXXXXX XXX XXX XXX XXX XXX XXX XXX XXXXXX
(S) = "Special" Model also available in this series. (H) = "Heavy Duty" Model also available in this series. * = Optional Tandem Axle Equipment is available on these models Series 3000 = Light Duty Series 4000 & 5000 = Medium Duty Series 6000 = Special Medium Duty Series 7000, 8000, 9000 & 10000 = Heavy Duty NOTE: Starting in 1957 ALL Series 4000 and 6000 model wheelbases are lengthened by 2.5 inches to provide for the use of larger size tires without causing interference between the wheel and the toe pan on extreme turns. This wheelbase change is accomplished by moving the front axle forward on the springs, shortening the front overhang. Front fenders with wider wheel openings were also used.
1958	3A 3B 3C 3D 3E 3F 3G 4A 4B 4C 5A 5B 5C 5D 5E 5F 5G 5H 5J 5K 5L 5M 6A 6B 6C 6D 6E 6F 6G 6H 6J 6K 6L 6M 6N 6P 6R 6S 7A 7B 7C 8A 8B 8C 8D 8E 8F 9A 9B 9C 10A 10B 10C 10D 10E 10F	3100 3200 3400 3500 3600 3700 3800 ** 4100 4400 4500 5100 5400 5700 5100S 5400S 5700S 5100H 5400H 5700H 5300 5300S 5300H 6100 6400 6500 6702 6800 6100S 6400S 6500S 6200 6600 6100H 6400H 6500H 6300 6300S 6300H 7100 7200 7700 8100 8200 8400 * 8500 * 8700 * 8800 9100 9200 9700 10100 10200 10400 * 10500 * 10700 * 10800	114 123.2 104 125 123.2 137 135 132.5 156.5 156.5 112.6 136.6 160.6 112.6 136.6 160.6 112.6 136.6 160.6 124.6 124.6 124.6 132.5 156.5 174.5 196.5 222.2 132.5 156.5 174.5 129.6 153.6 132.5 156.5 174.5 144.5 144.5 144.5 112 124 172 132.5 144.5 154.5 174.5 192.5 240 112 124 172 132.5 144.5 156.5 174.5 192.5 240	XXX XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis School Bus Chassis XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis
S = "Special" Model also available in this series. H = "Heavy Duty" Model also available in this series. * = Optional Tandem Axle Equipment is available on these models ** = Optional Four Wheel Drive Equipment is available on these models Series 3000 = Light Duty Series 4000, 5000, 6000, 6000S & 6000H = Medium Duty Series 7000, 8000, 9000 & 10000 = Heavy Duty
1959	3A 3B 3C 3D 3E 3F 3G 4A 4B 4C 5A 5B 5C 5D 5E 5F 5G 5H 5J 5K 5L 5M 6A 6B 6C 6D 6E 6F 6G 6H 6J 6K 6L 6M 6N 6P 6R 6S 6T 6U 6V 7A 7B 7C 8A 8B 8C 8D 8E 8F 9A 9B 9C 10A 10B 10C 10D 10E 10F	3100 3200 3400 3500 3600 3700 3800 ** 4100 4400 4500 5100 5400 5700 5100S 5400S 5700S 5100H 5400H 5700H 5300 5300S 5300H 6100 6400 6500 6702 6800 6100S 6400S 6500S 6200 6600 6100H 6400H 6500H 6300 6300S 6300H 6700S 6700 6703 7100 7200 7700 8100 8200 8400 * 8500 * 8700 * 8800 9100 9200 9700 10100 10200 10400 * 10500 * 10700 * 10800	114 123.2 104 125 123.2 137 135 132.5 156.5 156.5 112.6 136.6 160.6 112.6 136.6 160.6 112.6 136.6 160.6 124.6 124.6 124.6 132.5 156.5 174.5 196.5 222.2 132.5 156.5 174.5 129.6 153.6 132.5 156.5 174.5 144.5 144.5 144.5 196.5 196.5 196.5 112 124 172 132.5 144.5 154.5 174.5 192.5 240 112 124 172 132.5 144.5 156.5 174.5 192.5 240	XXX XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis School Bus Chassis XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis XXX XXX XXX XXX XXX XXX XXX XXX School Bus Chassis
S = "Special" Model H = "Heavy Duty" Model * = Optional Tandem Axle Equipment is available on these models ** = Optional Four Wheel Drive Equipment is available on these models Series 3000 = Light Duty Series 4000, 5000, 6000, 6000S & 6000H = Medium Duty Series 7000, 8000, 9000 & 10000 = Heavy Duty

GMC Codes?? You want GMC CODES??? Geez, I just about went blind just doing the Chevrolet codes! Maybe Jolly will do those over on his site :)

v. Feb 06