GJDiesel

GJDiesel Diesel Performance Perfected. Keeping Montana’s Diesels on the Road Since 1993. E-commerce store launching soon!

Expert repair, precision machining & performance parts for Power Stroke, Cummins & Duramax. G & J Diesel has been serving Billings, Montana and the surrounding area for over 20 years. We specialize in the Ford Powerstroke, GM Duramax and Dodge Cummins diesel trucks. From maintenance and repairs to power and performance,
G & J has the knowledgeable staff to assist you. G & J Diesel is also a direct

distributor of many of the products we sell. We offer an extensive line of products and services to meet all of your diesel automotive needs.

06/21/2026
We Need These Gone — Stage 6 Allison TransmissionsWe have two Stage 6 4x4 Allison transmissions sitting here ready to sh...
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

Guess the FailureAlright, tech check. 🛠️ Who recognizes this plastic "snake" pulled out of a customer's truck, and what ...
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. 👇

Some of these new guys will never understand the struggle…Back in the dark ages of wrenching, this was the shop light of...
05/21/2026

Some of these new guys will never understand the struggle…
Back in the dark ages of wrenching, this was the shop light of choice — also known as the forearm branding iron. 🔥😆
If you’ve ever rolled out from under a truck with a burnt arm, dropped this thing on your face, or left a little skin behind on the cage… congratulations, you’re a real mechanic.
These younger techs with their cool LEDs and rechargeable lights got it easy… and honestly, it shows. 😂

Address

1745 Main Street
Billings, MT
59105

Opening Hours

Monday 8am - 12pm
1pm - 5pm
Tuesday 8am - 12pm
1pm - 5pm
Wednesday 8am - 12pm
1pm - 5pm
Thursday 8am - 12pm
1pm - 5pm
Friday 8am - 12pm
1pm - 5pm

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