GMC Motorhome Manuals

This list of downloadable files and/or links is compiled as a service to the GMC Community. Accuracy is not guaranteed. Independent verification is urged. In addition, links are tested periodically but items/sites may have moved or dissolved.

Thank you, to the contributors that took the time to scan and/or share these items. When available, contribution credits are listed. We welcome all historical and technical information related to the GMC Motorhome.

Please submit changes, alterations or additional items you would like to share to . Thank you!


>> Maintenance Manuals

X7425 | 1973-1974 Maintenance Manual (Source: Toby Maki)

X7525 | 1975-1976 Maintenance Manual (Source: Emery Stora)

X7625 | 1976 Maintenance Manual Supplement (Source/Scan: Richard Waters)

X7725 | 1977-1978 Maintenance Manual Supplement (Source: Emery Stora)


>> Miscellaneous Manuals

GMC Factory Assembly Manual

P30 Chassis Manual

Transmode Body Builders Manual (Source/Scan: Emery Stora)

X7482 | 1974 Emission Control Systems


 >> Owner’s Operating Manuals

1976 Coachmen Owner’s Manual (Source: Alex Sirum GMC Motorhomes, Inc.)

1977 Coachmen Owner’s Manual (Source: Dan Mackinnon)

Avion Owner’s Operating & Service Manual (Source: Tommy Walker)

X7321A | 1973 Owner’s Operating Manual (Source/Scan: Emery Stora)

X7321C | 1974 Owner’s Operating Manual (Source: Erv Troyer)

X7521A | 1975 Owner’s Operating Manual | Effective prior to TZE166V100878 (Source: Jim Melberg)

X7521B | 1975 Owner’s Operating Manual | Effective with TZE166V100878 (Source: Emery Stora)

X7580A | 1975 Transmode Operating Manual (Source: Tommy Walker)

X7621A | 1976 Owner’s Operating Manual (Source: Louie Diamond)

X7680A | 1976 Transmode Owner’s Operating Manual

X7621B | 1976 Owner’s Operating Manual | Covers 1976 GMCs starting with TZE166V100878 (Source: Russell Mehlenbacher)

X7680A | 1976 Transmode Owner’s Operating Manual (Source: Rob Mueller)

X7680B | 1976 Transmode Owner’s Operating Manual (Source: Len Novak)

X7721A | 1977 w455 Engine Owner’s Operating Manual (Source: Emery Stora)

X7721B | 1977 w403 Engine Owner’s Operating Manual (Source: Chuck Blanford)

X7780B | 1977 Transmode w403 Engine Owner’s Operating Manual (Source: Chuck Blanford)

X7821A | 1978 Owner’s Operating Manual (Source: Merrill Webb)

X7880A | 1978 Transmode Owner’s Operating Manual


>> GMCMI Newsletter Collection & GMC Motorhome Information Available on Flash Drive

The 8g flash drive consists of over 1,200 items, here is a sampling: GMCMI Newsletters, Newsletter Article Index, Member Rosters and Addendums, GMC Parts and Service Suppliers Listings, Operators, Maintenance, and Onan Manuals, Wiring Diagrams and Structural Drawings, Factory Service and Recall Bulletins available on the GMCMI website.

All this information and tools are available on the drive itself. It does not require internet access and can be carried in your pocket for ease of access. This indispensable collection of GMC documentation and tools is available for purchase by GMCMI members for only $20 (shipping included)!

Order your GMCMI flashdrive by sending $20 to Kim Weeks, 1402 So. Cage Blvd. Unit 273, Pharr, TX 78577 or PayPal $21 to and note that it is for the GMCMI Flash Drive.