[1968C10LWB]

You sir made my day, thank you!

David

Originally Posted by hatzie

I usually post on the 73-87 side but I have collected copies of most of the 67-72 light truck service literature.
PDF scans of 1967-1972 GMC and Chevrolet Light 10-30, Medium 40-60, and Heavy 70-90 Truck Service Manuals from my library.
The links are to the PDF files on MediaFire.
I personally like paper manuals that I can hold in my hands. These PDF files are a good compromise till you can buy a hardcopy. I made them searchable allowing me to find the pages I'm looking for and slip in bookmarks so I can find them again in the shop.
The paper manuals aren't expensive and are well worth buying used when they come up.

• 1967
• X6705_1967_GMC_Wiring_Diagrams_After_August_22_1966
• ST_133_67_1967_Chevrolet_Chassis_Service_Manual_10_to_60_Truck
• ST_134_67_1967_Chevrolet_Chassis_Overhaul_Manual_10_to_60_Truck
• ST_135_67_1967_Chevrolet_Chassis_Shop_Manual_70_to_90_Truck
• .
• 1968
• X6805_1968_GMC_Wiring_Diagrams_After_December_1_1967
• ST_133_68_1968_Chevrolet_Chassis_Service_Manual_10_to_60_Truck
• ST_134_68_1968_Chevrolet_Chassis_Overhaul_Manual_10_to_60_Truck
• ST_135_68_1968_Chevrolet_Chassis_Service_Manual_70_to_90_Truck
• .
• 1969
• X6905_1969_GMC_Wiring_Diagrams_After_August_12_1968
• X6932_1969_GMC_Chassis_Service_Manual_1500_to_3500_Truck
• X6933_1969_GMC_Chassis_Service_Manual_4000_to_6500_Truck
• ST_134_69_1969_Chevrolet_Chassis_Overhaul_Manual_10_to_60_Truck
• ST_135-69_1969_Chevrolet_Heavy_Truck_70-90_Service_Manual * NEW April 6, 2013 *
• .
• 1970
• X7005_1970_GMC_Wiring_Diagrams_After_Sep_02_1969
• ST_133_70_1970_Chevrolet_Chassis_Service_Manual_10_to_60_Truck
• ST_131_70_1970_Chevrolet_Chassis_Overhaul_Manual_Passenger_Cars_10_to_60_Truck_and_1969_Corvette
• ST_135_70_1970_Chevrolet_Chassis_Service_Manual_70_to_90__Heavy_Truck * NEW April 6, 2013 *
• .
• 1971
• X7105_1971_GMC_4500-9500_Wiring_Diagrams_After_August_10_1970
• ST_330_71_1971_Chevrolet_Truck_10-30_Chassis_Service_Manual
• ST_333_71_1971_Chevrolet_10-30_Truck_and_Passenger_Car_Chassis_Overhaul_Manual
• ST_140_71_1971_Chevrolet_Van_Sportvan_10-30_Chassis_Service_Manual
• ST_334_71_1971_Chevrolet_Chassis_Overhaul_Manual_40_to_60_Truck
• ST_331_71_1971_Chevrolet_Chassis_Service_Manual_40_to_60_Truck
• ST_332_71_1971_Chevrolet_Chassis_Shop_Manual_Supplement_70_to_90_Heavy_Truck(Supplement to 1970_ST135-70)
• .
• 1972
• X7205_1972_GMC_Wiring_Diagrams_After_August_2_1971
• ST_330_72_1972_Chevrolet_Truck_10-30_Chassis_Service_Manual
• ST_333_72_1972__Chevrolet_10-30_Truck_and_Passenger_Car_Chassis_Overhaul_Manual
• ST_140_72_1972_Chevrolet_Van_Sportvan_10-30_Chassis_Service_Manual
• ST_334_72_1972_Chevrolet_Chassis_Overhaul_Manual_40_to_60_Truck
• ST_332_72_1972_Chevrolet_Chassis_Service_Manual_40_to_60_Truck (Supplement to ST-331-71 1971 40-60 Service Manual)
• ST_332_72_1972_Chevrolet_Chassis_Service_Manual_Supplement_ 70_to_90_Heavy_Truck (Supplement to 1970_ST135-70 & 1971_ST332-71) * NEW April 6, 2013 *
• .

I will eventually scan and link all the manuals on this list. If it's not listed I don't own it.

Wiring manuals cover all GMC light through heavy models in the year listed.
My scanner only handles 12"x32" pages. The longer fold-out pages in the 68-72 wiring manuals have been scanned from both ends and stitched to the full original length.