Diehard Diesel

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Diehard Diesel Locally owned and operated in Grande Prairie. Specializing in duramax, powerstroke, and cummins diesels.

Also offering in shop and mobile service for HD diesels on and off highway. Custom tuning, emissions fixes, engine work, & performance upgrades.

Call out to grande cache for a hyd pump install on a 345 cat excavator. Hasn't worked in 3 years and now shes back to sl...
10/03/2026

Call out to grande cache for a hyd pump install on a 345 cat excavator. Hasn't worked in 3 years and now shes back to slingin rock.

Another l5p we just finished up a full delete on. Single tune, 4" exhaust with muffler. Ready for many miles.••• ...
10/17/2025

Another l5p we just finished up a full delete on. Single tune, 4" exhaust with muffler. Ready for many miles.
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Another lml in the books. Came in for de-rating issues p2263 turbo performance, and exhaust smell in the cab. Found brok...
10/16/2025

Another lml in the books. Came in for de-rating issues p2263 turbo performance, and exhaust smell in the cab. Found broken exhaust manifold bolts, inflated up pipe bellows, seized turbo veins and a couple of other issues from the previous work that done on it. We did an egr delete, fresh turbo, glow plugs and up pipes as well as a water pump while the cab was off.
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Some more pics of the most recent lml duramax engine we built. Built proper and built to last.•••
10/10/2025

Some more pics of the most recent lml duramax engine we built. Built proper and built to last.
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Beautiful ford f550 we just finished some work on. Single tune, egr delete and a 4" exhaust with muffler. Ready to rock ...
10/08/2025

Beautiful ford f550 we just finished some work on. Single tune, egr delete and a 4" exhaust with muffler. Ready to rock n roll.
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#6.7powerstroke #6.0 #6.4 #7.3

Sexy l5p we just finished a full delete on for a good friend of ours. Egr, dpf delete, def tank drop with a 5" exhaust a...
10/07/2025

Sexy l5p we just finished a full delete on for a good friend of ours. Egr, dpf delete, def tank drop with a 5" exhaust and sotf tuning. Say good bye to de rates.
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Big job we just finished up! Lml came in with a couple cracked pistons (video at the end). So we built this customer a f...
10/06/2025

Big job we just finished up! Lml came in with a couple cracked pistons (video at the end). So we built this customer a fresh long block, with new pistons, keyed crank, fresh bearings, oil pump, l5p oil cooler, head studs, etc the whole works. We pulled the old engine and installed new as well as did new injectors, cp3 conversion and a fass lift pump. Truck is ready for another life! All machine work was done by only the best . Thanks for the great work as always.

Clean lbz we just finished up that came in for egr delete and a new turbo. Back off she goes.••• ...
09/15/2025

Clean lbz we just finished up that came in for egr delete and a new turbo. Back off she goes.
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Sweet 6.7 cummins we had in with turbo issues. Ditched the vgt and went to a fixed vane s363 with a bd exhaust brake. Al...
08/27/2025

Sweet 6.7 cummins we had in with turbo issues. Ditched the vgt and went to a fixed vane s363 with a bd exhaust brake. Also did the grid heater nut fix as well to prevent nut from falling in engine. With some fresh tunes this truck is ready to rock again.
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#6.7cummins

Swipe to see the shop truck having some fun. S400 LLY with a couple of goodies. Turbo kit was built in house.••• ...
07/25/2025

Swipe to see the shop truck having some fun. S400 LLY with a couple of goodies. Turbo kit was built in house.
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Address

Grande Prairie, AB
T8X0A6

Opening Hours

Monday 7am - 5pm
Tuesday 7am - 5pm
Wednesday 7am - 5pm
Thursday 7am - 5pm
Friday 7am - 5pm

Telephone

+17809834305

Website

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