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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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knuckle comparisons between OEM and one-ton including measurements by Jim Roundtree
DO NOT replace the main fusible link with a fuse or circuit breaker as recommended by some.
A GM service manual on troubleshooting issues in the TH425 and TH400 transmissions
Replacing obsolete K3 relay with readily available parts
A detailed DIY document on the one-ton front end
Bill Hubler was one of the first to engineer and install the one-ton front end on a GMC motorhome
Template and instructions on how to open a locked entry door
Fuel Injection - EBL system IAC Control
2024-08-23
How the EBL system IAC control works.
Zay Brand's excellent document on dash HVAC operation and improvements
Calipers use a built-in motor for parking brake. Kit developed by Albert Branscombe
GMCWS technical seminar 10/10/2006 by Chuck Botts, Jim Kanomata & Grandpaw Billy
A better fix than the APC for the alternator exciter wiring overheating issue
OEM Cruise Control Service Manual
2024-04-03
1968-1982 Cruisemaster cruise control service manual
Six wheel laser level wheel alignment
2024-02-04
How I use a laser level to check and align toe and camber on all 6 wheels.
All about GM HEI distributors
2024-02-01
Everything you wanted to know about HEI distributors
Delco HEI Ignition Service Info
2024-01-24
All you ever wanted to know about HEI ignition, including matching coil and pickup polarity
Adding a separate second filler vent line for the front tank for a better refuelling experience.
Article about the new motorhomes from GMC and FMC