Great Canadian Diesel LTD.

10/08/2026

Another one dialed in. 🔥

This 2017 High Country 5.3L came to us with a BTR Truck Norris cam and some tuning issues, including an annoying stalling problem.

We got the calibration cleaned up, fixed the stalling, dialed in the low end torque and completely woke this truck up. It pulls like a freight train up top and drives the way a cammed 5.3 should.

Troy called us after putting some miles on it and couldn’t have been happier with the results!

Proper tuning makes all the difference. 🤘

09/08/2026

🇨🇦 2018 GMC Sierra | GCD Tuned

Another Duramax dialed in with our #1 recommended L5P tuning package:

⚡ Shift-on-the-Fly tuning
⚙️ Transmission tuning
💨 Full delete

Transmission tuning is a big part of getting the complete package right, improving shift quality, optimizing line pressure and converter lockup, and making sure the transmission works properly with the added power and torque.

The result? Better response, cleaner shifts, and a truck that feels completely different to drive.

If you’re tuning your Duramax, don’t overlook the transmission. Do it right the first time. 🇨🇦

Great Canadian Diesel x MOTOR OPS TUNING Best in the business 👊

GMCDuramax

09/03/2026

08/18/2026

Another 5.3L Vortec getting the Great Canadian Diesel treatment. 🇨🇦🔥

Custom ECM + TCM tuning with AFM disabled, speed limiter removed, quicker/firmer shifts, reduced transmission slip, sharper throttle response and stronger overall performance.

Nothing crazy, just making the truck drive the way it should. Enjoy your sweet GMC Brodie Traverse 👌

Want to wake up your 5.3L? Shoot us a DM and we’ll get you dialed in.

08/15/2026

11.18 @ 121 MPH. On 93 octane. 😮‍💨🔥

Just a custom Stage 1 tune on the 2026 SQ7. Stock hardware and a car seat in the back.

H31 ECM | the one you might’ve been told “can’t be tuned.” On the 2025 and up models. We got you!

APR can’t do it?
Unitronic can’t do it?

GCD can get you straightened away 🇨🇦

If you’ve got an H31 SQ7/SQ8 and have been told you’re out of luck, give us a shout.

08/09/2026

440,000 km and still showing them how it’s done. 🤘

This ’06 LBZ came in for a little freshening up, 4” straight pipe, delete, and a Sport/Economy tune.

Running clean, driving right, and honestly just an incredible old truck. These LBZs were built different. 🇨🇦

Another one back on the road and ready for a few hundred thousand more.

08/01/2026

Not diesel… but I couldn’t resist. 😏

Straight into the turbos. No airboxes. Just pure turbo noises.

Turn the volume up 🔥🫡



Steven Pearson you’re one hell of a calibrator sir 🔥

07/29/2026

Think Great Canadian Diesel only tunes diesels? Think again. 😉

We also offer custom tuning for GM gas trucks.

✅ Better throttle response
✅ Improved drivability
✅ Optimized transmission shift points
✅ Factory speed limiter removed
✅ Active Fuel Management (AFM) disabled

No gimmicks, just a truck that drives the way it should. Thank you for your business Carter McDonald

📩 Send us a message to get your GM gas truck tuned!

Huge shoutout to MOTOR OPS TUNING & Ahil for the incredible support and tuning! 🇨🇦🔥

04/24/2026

CP4 failure can take out your entire fuel system… and cost you $10K+ real quick.

But most of the time? It’s preventable.

If you want a shot at 1,000,000 kms out of your CP4, it comes down to doing a few things right:

• Run quality fuel ⛽️
• Use a good diesel additive🔥
• Stay on top of maintenance🛠️

BONUS ‼️ Install a FASS Fuel system. This increases the Net Positive Suction Head to the HPFP and feeds the CP4 with clean, deaerated fuel.

Take care of your truck, and it’ll take care of you.