1978 GMC Royale 26FT RV in Kalispell, MT

Location: Kalispell, Montana

Asking Price: $36,500 (Final Sale Price)

Update: 8/9/2026 –  This listing sold for the full asking price!

You are looking at this 1978 GMC Royale 26FT RV — available for sale by owner in Kalispell, Montana!

As of the time of this post, it is still available – you can find current pricing and contact the seller at the ad in our marketplace. If you want to skip our write-up, a direct link to that is at the bottom of this page just below the pictures.

This is a verified Premier Listing in our Marketplace.

Summary

1978 GMC Royal 26’ Side-Bath motorhome with 55,000 original miles on the 403 CID engine, stored in climate-controlled facilities and cared for by its third owner. This well-preserved coach features original exterior paint and decals with a thoughtfully upgraded “resto-mod” interior, including modernized flooring, cockpit, bathroom, lighting, and electrical systems while maintaining its classic GMC character. Upgrades include a Manny one-ton front-end conversion, Applied Air final drive upgrade, new shocks and air bags, LED lighting, backup camera, upgraded converter and batteries, remodeled side bath, new furnace, propane water heater, convection microwave, stereo, and serviced 6kW Onan generator. A rare, comfortable vintage GMC coach ready for continued travel.

Key Info:

• Location: Kalispell, MT
• Year: 1978
• VIN: TZE368V101505
• Odometer: 50,007
• Length (ft): 26
• Type: Motorhome
• Model / Trim: Royale
• Floorplan: side-bath
• Maintenance Logs: Partial History
• Engine: Oldsmobile 403 V8
• Transmission: Turbo-Hydramatic 425
• Generator: Onan 6000
• Generator Hours: 91
• Tire Brand: Yokahama
• Air Conditioner: General Motors
• # of AC Units: 2
• Awning Type: Zip-Dee
• # of Awnings: 1
• Condition: Good

Seller Write-up

1978 GMC Royal 26′ Side-Bath Coach

Original MSRP: $39,450 (1978 dollars)
55K original miles on 403CID motor. Stored in climate-controlled facilities. Third owner of this coach.

Exterior is in original paint and decals.

Interior is very close to the original design. Flooring, ceiling panels, cockpit seats, and dry bath have been replaced or upgraded to address wear and tear. This coach may best be described as a “resto-mod” where components requiring replacement have been upgraded or modernized to improve performance or safety while keeping the overall look and feel of the original coach.

Currently set up with the rear lounge used as the bedroom with a queen-size bed. The dinette converts to a full bed, allowing sleeping for up to four without major conversions.

Upgrades & Features

• Manny One-Ton front-end upgrade including new Chevy 1-ton suspension components, front disc brakes, and wheel spacers

• Applied Air GMC final drive upgrade with modified final drive ratio to improve vehicle performance in mountainous driving

• All new KYB shocks (6)

• New air bags (standard GMC design)

• Exterior running lights replaced and/or upgraded to LED

• New LED headlights and fog/driving accessory lights

• New Ramco rear view side mirrors

• Backup camera and accessory navigation

• New Power Dynamics power converter

• Two new Dura-Cell marine house batteries

• House battery monitor

• All interior lighting converted to LED

• New Ultra-suede cockpit captain’s chairs

• New cockpit carpeting and dash pad

• New tachometer and gauges

• New LVP flooring except under dinette table

• New kitchen faucet

Bathroom Upgrades

• Full side-bath remodel

• New polished travertine stone countertop and backsplash

• New wall tile

• New medicine cabinet

• New sink and faucet

• New hardwood vanity front with added drawer and improved storage

• American walnut finish matching the rest of the coach cabinetry

• New bath exhaust fan

• New high-rise toilet

Interior & Appliance Upgrades

• New HDTV antenna and interior cables

• New in-dash stereo unit

• New Samsung convection/microwave oven replacing the original Radar Range unit

• New walnut-covered range cover

• Original 4-burner gas range-top

• Blender and accessories included and functional

• New 6.5-gallon propane hot water heater

• New Suburban gas furnace and distribution piping

Electrical & Generator

• Recently serviced 6kW Onan generator

• Exterior/interior weather station (functions on 110V shore power or generator)

This coach has been loved and maintained since purchased in 2016 and still has plenty of life and enjoyment left for its next owners.

Photo Gallery

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CLICK HERE to view this 1978 Royale 26FT in our Marketplace

**Please note this GMC RV was originally listed for sale in July of 2026. Depending on when you are viewing this article it may have since been sold.**

Last Updated on August 10, 2026 by GMC RV For Sale