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DO NOT replace the main fusible link with a fuse or circuit breaker!DO NOT replace the main fusible link with a fuse or circuit breaker as recommended by some.
- RF_Burns
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GMC Motorhome Tire & Wheel InformationThe definitive guide to tire and wheel options for the GMC Motorhome
- Christo
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Universal joint in tilt steering column is wornI hope this fixes the last of the "play" in my steering
- RF_Burns
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What every GMCer needs to knowA list of useful GMC MH information from soup to nuts!
- RF_Burns
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Embedded Lockers Flash What's Up DisplayInstructions for the What's Up Display for the EBL
- billvv
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Latest reviews
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Disc brake upgrades, part numbers and donor vehiclesThe Eldorado calipers are 63.5mm and have a parking brake lever. Be sure to use D122 pads with...- Christo
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Heat/AC Dash Control and Vacuum Control operation 2021-05-30John gave a great presentation at the 2018 GMCMI Tucson!- Richard RV
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Resource 'Starting an engine that has been sitting for an extended period'
Technical Corner MAINTENANCE, RENOVATIONS, AND MORE Starting an Engine That Has Been Sitting for an Extended Period Larry Weidner | 1978 Royale | Menomonie, Wisconsin 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 drive it home. Sometimes they...- Christo
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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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"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
Embedded Lockers Flash What's Up Display
2025-05-22
Instructions for the What's Up Display for the EBL
A great presentation on the operation of the HVAC control panels
An overview of how mechanical cooling works and upgrading compressors.
T
Fixes bleeding and braking problems caused by common brass proportioning valve
Contains info on fueling parameters and Eprom addresses
EBL Flash ECM final firmware update Ver 2.7
2025-04-02
This is the final firmware update RobR put out for the EBL Flash ECM (Note: Requires WUD 3.1)
A step-by-step guide to using the free Glympse app
Dave Lenzi's Large Mid-Axle Disk Brake System overview
- Featured
The definitive guide to tire and wheel options for the GMC Motorhome
Fan Shroud Modification, lose 25 lbs and gain access to belts etc. From Billy Massey's HTML document
Wiring diagrams for EBL based 7747 engine control module