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roger0080 · 11-06-2005, 01:37 AM

Yup. I missed posting the year "B" code.

Rod, I am correct on the series and body as being "20" and "D" not "2" and "0D" as you claim. Here's why:

*When* the VIN has the complete model number in it (like it is for 1967's) "CS1590DPC1227A" it decodes as a true Model number decode: "1" is the series code and "0D" is the body code which we all know.

But, when when GMC changed to stripped/condensed/abbrieviated Model number in the VIN for 1968 as the OP has it: "KM20DPB54015" (not the full model number, not containing the Cab to Axle code), then the series code really is "20" and the body code is "D".

ie:
1967: CM2590DPC1001A Series = 2, Body = 0D (full Model number)
1968: CM20DPB10001 Series = 20, Body = D (shortend Model number)
1968: CM20DPA10001 Series = 20, Body = D
1970: CE134ZZ54321 Series = 1, Body = 34
1971: CE134Z154321 Series = 1, Body = 34
1972: TCS142F123456 Series = 1, Body = 4 Like Chevrolet does

References on this is:
1967, 1968, 1969, 1971 GMC Truck Service Manuals. Manuals X-6732, X-6832, X-6932, X-7132, X-7232. I missing the 1970 manual, but saw your post over thread number 178956 for 1970.

Not to nit pick but you generally miss explaing the dash or in this case the second K in LSGarage's VIN KM1590DKPC1226A. That second K, is the State Certification code. When the K is present, the truck has the Z55K option on it. If it is a dash (or space in earlier years) which is the norm, then no State Certification applies. Z55K only applied to Pennsylvannia trucks. There is also and RPO for the 2Ton trucks. The Dealer Data books cover that and the Blue Factory Assembly manual only references this.

****LSGarage, could you PLEASE PLEASE PLEASE post your glove box option sticker!!!? I have been watching and watching and watching for years for a VIN on here and on e-bay that has that Z55K option on it! Could you please check the option sticker and see if it has that option on it? Or email me roger0080@netscape.net. Thanks man!!!! You have the rarest of all VIN's I know of with that 2nd K in it.

Hope this all helps everyone. I know Rod wants to report factual information and I do too. I do believe I am correct on this. It's late and I hope I rambled correctly!

11-06-2005, 01:37 AM	#10
roger0080 Registered User Join Date: Nov 2000 Location: Carver County, Minnesota, USA Posts: 627	Re: Oddball ID number Yup. I missed posting the year "B" code. Rod, I am correct on the series and body as being "20" and "D" not "2" and "0D" as you claim. Here's why: When the VIN has the complete model number in it (like it is for 1967's) "CS1590DPC1227A" it decodes as a true Model number decode: "1" is the series code and "0D" is the body code which we all know. But, when when GMC changed to stripped/condensed/abbrieviated Model number in the VIN for 1968 as the OP has it: "KM20DPB54015" (not the full model number, not containing the Cab to Axle code), then the series code really is "20" and the body code is "D". ie: 1967: CM2590DPC1001A Series = 2, Body = 0D (full Model number) 1968: CM20DPB10001 Series = 20, Body = D (shortend Model number) 1968: CM20DPA10001 Series = 20, Body = D 1970: CE134ZZ54321 Series = 1, Body = 34 1971: CE134Z154321 Series = 1, Body = 34 1972: TCS142F123456 Series = 1, Body = 4 Like Chevrolet does References on this is: 1967, 1968, 1969, 1971 GMC Truck Service Manuals. Manuals X-6732, X-6832, X-6932, X-7132, X-7232. I missing the 1970 manual, but saw your post over thread number 178956 for 1970. Not to nit pick but you generally miss explaing the dash or in this case the second K in LSGarage's VIN KM1590DKPC1226A. That second K, is the State Certification code. When the K is present, the truck has the Z55K option on it. If it is a dash (or space in earlier years) which is the norm, then no State Certification applies. Z55K only applied to Pennsylvannia trucks. There is also and RPO for the 2Ton trucks. The Dealer Data books cover that and the Blue Factory Assembly manual only references this. ****LSGarage, could you PLEASE PLEASE PLEASE post your glove box option sticker!!!? I have been watching and watching and watching for years for a VIN on here and on e-bay that has that Z55K option on it! Could you please check the option sticker and see if it has that option on it? Or email me roger0080@netscape.net. Thanks man!!!! You have the rarest of all VIN's I know of with that 2nd K in it. Hope this all helps everyone. I know Rod wants to report factual information and I do too. I do believe I am correct on this. It's late and I hope I rambled correctly! __________________ 72 Chev C-10 90% restored (former AZ truck) ... 71 Chev K-20 Cheyenne my vacation crusier... 72 Chev C-10 Now retired and striped after many faithful miles... 72 GMC 1500 Retired to the junk yard after bought new in '71...