Johns United Auto Clinic

Johns United Auto Clinic Johns United Auto Clinic has been in business for 30 years. We service and repair ALL Types of vehic

09/23/2026

This Triumph TR6 came into the shop with a serious misfire.

After completing a full compression test and leak-down test, we found two cylinders completely dead, confirming the issue was much deeper than a simple tune-up.

This one will be back soon for a complete engine rebuild to bring it back to proper running condition.

Proper diagnosis first, proper repair second. 🔧

ClassicCars EngineRebuild CompressionTest LeakDownTest EngineDiagnostics ClassicCarRepair Mississauga GTAClassicCars

09/22/2026

This 1972 Corvette came in with a tired rear end and plenty of worn-out components.

JUST IN TIME FOR COBBLE BRACH CONCOURS.

We completely rebuilt the differential with a new Yukon Positraction unit, fresh stub axles, and replaced the worn components throughout to bring everything back up to spec.

No shortcuts — just fresh parts, proper setup, and a rear end that’s ready to handle the road again.

Another classic getting the attention it deserves at Johns United Auto Clinic. 🔧🇺🇸

YukonGear Positraction DifferentialRebuild ClassicCorvette ClassicCars MuscleCars Restoration PerformanceShop Mississauga GTAClassicCars

09/18/2026

A very special 1972 Corvette LT1 in for final service and preparation ahead of the Cobble Beach Concours d’Elegance this weekend.

This car received a full round of mechanical attention, including a rebuilt differential with 4.11 gears, Wilwood braking system, new steering components, all-new suspension bushings, and complete fluid service.

The goal was simple: preserve the character of an iconic LT1 Corvette while ensuring every mechanical detail performs as beautifully as the car presents.

Now fully sorted, refined, and ready for the show field at Cobble Beach.

CobbleBeach CobbleBeachConcours ConcoursDElegance WilwoodBrakes ClassicCorvette CorvetteRestoration VintagePerformance ShowCar ClassicCarService

09/16/2026

1967 Pontiac GTO getting a serious modern upgrade 🔥

Out with the old 326 and in with a built 5.3L LS setup.

This combo is getting:
• Built 5.3 LS
• Summit Racing Pro LS rods & pistons
• BTR Red Hot cam
• 4L80E transmission
• March Performance front drive system

Keeping the classic GTO look while giving it the power, reliability, and drivability of a modern LS platform.

Follow along as we bring this build together from start to finish. 💪

LSSwap 53LS BuiltLS BTR BTRCam RedHotCam 4L80E MarchPerformance SummitRacing MuscleCar ClassicCar Restomod LSPerformance CustomBuild OntarioCars GTAcars

09/14/2026

Fresh 390 Ford getting the valvetrain dialed in 🔧🔥

Valve adjustment underway before this fresh FE gets fired up. Taking the time to set everything properly now makes all the difference for performance, reliability, and keeping this build happy.

Another classic Ford getting one step closer to hitting the road.

📍 Johns United Auto Clinic
🔧 Classic • Custom • Performance

ClassicFord EngineBuild ValveAdjustment Valvetrain MuscleCar ClassicCar PerformanceShop BuiltNotBought

09/10/2026

🔧 1985 Oldsmobile Cutlass Supreme in the shop at Johns United Auto Clinic

This classic Cutlass came in needing a few important repairs and some much-needed attention.

• Oil pan leak
• Front timing cover leak
• Additional oil leak repairs and resealing
• Vacuum line repairs
• Emergency brake cable replacement
• A/C conversion from R12 to R134a

On these older vehicles, fixing the small issues before they turn into bigger problems is key — especially when it comes to oil leaks, vacuum systems and braking components.

We’re getting this Oldsmobile cleaned up, sealed up and ready to enjoy again.

Whether it’s routine maintenance, restoration repairs, diagnostics or performance work, Johns United Auto Clinic keeps the classics on the road.

📍 Johns United Auto Clinic
🔧 Classic • Custom • Performance • Repair

OldsmobileCutlass ClassicCars ClassicCarRepair OldSchoolCars OilLeakRepair ACConversion R134a MuscleCars GBody GBodyNation OntarioCars GTAClassicCars

08/25/2026

1966 C30 BODY SWAP — SHORTENING THE RAM FRAME

Getting the 1966 C30 cab and box to sit right on the 2004 Ram chassis meant changing the wheelbase.

We shortened the frame down to 127 inches by plasma cutting the chassis, removing 13 inches, then sliding the frame section back into the existing frame channel.

Once everything was measured, squared and positioned correctly, the frame was welded back together and reinforced to lock the new wheelbase in.

A lot more involved than just dropping an old body onto a newer chassis — everything has to land where it belongs.

Next step: getting the cab and box sitting exactly where we want them.

At Johns United Auto Clinic, we provide complete fleet maintenance and repair for cars, vans, pickups, and commercial ve...
08/25/2026

At Johns United Auto Clinic, we provide complete fleet maintenance and repair for cars, vans, pickups, and commercial vehicles. With over 30 years of automotive experience, our goal is simple: minimize downtime, keep costs under control, and get your vehicles back to work.

From routine maintenance to advanced diagnostics and major repairs, we handle it all:

• Preventative maintenance
• Oil & fluid services
• Brake & suspension repairs
• Engine & drivetrain repairs
• Electrical diagnostics
• Check engine light diagnostics
• A/C & heating service
• Commercial & fleet vehicle repairs
• Inspections & maintenance
• Warranty repairs

We work with leading fleet management and warranty providers including Holman, Enterprise Fleet Management, Element Fleet Management, Global Warranty and Lubrico Warranty.

Fast turnaround. Competitive pricing. Reliable service.

📍 7195 Tranmere Drive, Unit #5
Mississauga, ON L5S 1N4

📞 905-672-5927

If your business depends on its vehicles, you need a shop you can depend on.

JohnsUnitedAutoClinic

08/19/2026

This 1949 Ford F100 is getting the cooling system its Coyote swap deserves. 🔥

A fully custom-fabricated radiator by Centerline Motorsports, built to pack serious cooling capacity into this classic truck and keep that Coyote happy no matter how hard it’s driven.

Old-school Ford. Modern Coyote power. Cooling built to match.

JUAC Performance

08/12/2026

OLD BLUE BUILD 🔵🛠️

1966 GMC C30 body ➡️ 2004 Ram 2500 Cummins chassis.

PART 1: Getting the old GMC body fitted and sitting right on the Dodge frame.

A lot more goes into a body swap like this than just dropping the cab on and bolting it down. Mounting, positioning, clearances and getting the proportions right before we move onto the next stage.

This one is going to be wild when it’s finished. 👀

Follow the build — OLD BLUE is officially underway.

59Cummins BodySwap C30 ClassicTruck CustomTruck TruckBuild DieselSwap JohnsUnitedAutoClinic JUAC BuiltNotBought

Address

7195 Tranmere Drive, Unit # 5
Mississauga, ON
L5S1N4

Opening Hours

Monday 7am - 4:30pm
Tuesday 7am - 4:30pm
Wednesday 7am - 4:30pm
Thursday 7am - 4:30pm
Friday 7am - 4:30pm

Telephone

+19056725927

Website

,

Alerts

Be the first to know and let us send you an email when Johns United Auto Clinic posts news and promotions. Your email address will not be used for any other purpose, and you can unsubscribe at any time.

Contact The Business

Send a message to Johns United Auto Clinic:

Shortcuts

Share

Category