here is something for the GMC owner
http://www.faxonautoliterature.com/%2F1967-1968-GMC-Truck-1500-3500-Repair-Shop-Manuals-on-CD-ROM-P22376.aspx
M1D
http://www.faxonautoliterature.com/%2F1967-1968-GMC-Truck-1500-3500-Repair-Shop-Manuals-on-CD-ROM-P22376.aspx
M1D