Resources
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Resource 'Starting an engine that has been sitting for an extended period.'
Starting an engine that has been sitting for an extended period. By Larry Weidner The following is just my humble opinion. I offer this FYI. Your milage may vary. Over the last 15 yrs I have seen a number of people get into GMCing buying a GMC that has been sitting for a number of years. In several of those cases, they were able to get the GMC started, put it in gear and drove it home. Sometimes they didn't make it when the engine went bad. Sometimes they made it home, but within a short...- LarryW
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Resource 'GMC Motorhome Tire & Wheel Information'
Wheels OEM (Factory) Steel Wheels Firestone Accu-Ride / Accuride Size: 16.5" x 6" Interesting article about the oddball wheel diameter Weight: ~40 lbs. Part #27995 (GM #359402) or 27725 Used from VIN #TZE165V101674 (mid-1975) onward For radial tires 85 PSI max Part number and ® (circled R) or "Radial" stamped on inside of wheel near valve stem Part #27604 (OBSOLETE) For bias ply tires ONLY. Do not use with radial tires. Part number stamped on outside of wheel between two lug holes...- Christo
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Thingiverse GMC Motorhome Items
2026-04-28
A collection of items from various makers on Thingiverse
An article about rebuilding the Olds 455 engine by Joe Mondello
Front Wheel Bearing Replacement
Rear hub seal & retaining nut proceedures
Updated file to show complete page.
Proper installation of real hub seal and retaining nut pre-load.
Rear Wheel Ramps
2025-12-16
Wooden ramps designed for tandem wheels
My reasoning on the lower rear-end ride height on the GMC.
Locks and keys info by Joe Ekl
2025-11-20
Information on the door, ignition and glove box locks and keys
Birch Screen Door
Step-by-step photos of the Gary Bovee electronic ignition kit installation.
Birch Screen Door
Source files to add the Winlog-EBL dash to a windows PC for monitoring the EBL throttle body ECM.
"What's up with EFI" presentation
2025-07-29
A presentation on EFI given at a GMCMI Rally
Howell EFI installation by Richard Waters
2025-07-29
An excellent detailed document on installating a Howell EFI kit.
Transmission Rebuild Video with Manny Trovao
2025-06-30
Rebuilding a Manny tranny
