GJDiesel

09/28/2026

Your truck works hard. Give it parts you can count on.

G&J Diesel stocks OEM and quality aftermarket parts for Cummins, Duramax, and Power Stroke—with knowledgeable people to help you get the right part.

From filters and maintenance supplies to injectors, turbos, and clutches, our parts counter is open to truck owners, independent repair shops, and fleets.

✅ Trusted brands, stocked right here in Billings
✅ Parts available over the counter for your own repairs
✅ Nationwide shipping available

Motorcraft • ACDelco • Bosch • Garrett • Holset • BD Diesel • FASS • S&S • PPE • ARP—and more.

Need a part? Call or text for pricing and availability.
📱 406-248-6366
🌐 GJDIESEL.com

The brands you trust. The diesel people you know.

08/12/2026

We want to wish our fearless leader a Happy Birthday! It figures I'd pick the one photo without his flip flops! 🤣

07/02/2026

07/02/2026

Today is a bittersweet day here at G&J Diesel.
One of our young apprentices, who started with us at just 15 years old as our “Head Floor Sweeper,” has now graduated high school and is headed into the armed services.
Over the years, we’ve had the privilege of watching him grow, learn, and push himself far beyond where he started. His progress has been incredible, and he has developed into a young man with solid A-tech level knowledge and a work ethic we are truly proud of.
He has been a great part of our team, and he will be greatly missed around the shop. More than anything, we are thankful for the time we had with him and excited to see where this next adventure takes him.
From all of us at G&J Diesel — congratulations, thank you, and we wish you the very best in your future and your service to our country.

06/05/2026

We Need These Gone — Stage 6 Allison Transmissions
We have two Stage 6 4x4 Allison transmissions sitting here ready to ship or install.
Both are dyno tested, include the converter, and still come with warranty.
$5,000 each
Available:
2001–2002 Stage 6 4x4 Allison
Part # 128136200
2004.5–2005 Stage 6 4x4 Allison
Part # 128136202
Core required. Freight and core not included.
A good rebuildable core must come back.
These are priced to move. Great deal for someone needing a built Allison for their Duramax.
Call G&J Diesel Sales & Service
406-248-6366
Billings, MT

06/02/2026

HAPPY BIRTHDAY KYLER

06/01/2026

Guess the Failure
Alright, tech check. 🛠️ Who recognizes this plastic "snake" pulled out of a customer's truck, and what symptom did they roll into the shop complaining about?
Drop your guesses in the comments. 👇