Diesel Engine Repair
From Cummins to Power Stroke to Duramax — we diagnose and rebuild. No guesswork, no part-swapping without a plan. We find the real problem.
Terrell, Texas
When was the last time your mechanic
actually listened?
We don't replace parts until we know what's wrong. No upselling, no jargon, no pretending you need something you don't. Just honest diesel work — from routine maintenance to full performance builds.
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What We Do
Diesel service that goes
deeper than a code reader
Performance Tuning
Stage 1 through full custom tunes. We map your truck to run harder, cleaner, and smarter — without sacrificing reliability or warranty.
Preventive Maintenance
Oil changes, flushes, filter replacements, and inspections that catch trouble before it leaves you stranded. Because your truck shouldn't dictate your schedule.
Diesel Exhaust & Emissions
DPF, EGR, DEF systems — we handle the stuff most shops avoid. Clean, legal, and built to last. We'll tell you if a delete is right for you, and we'll tell you if it isn't.
Transmission & Drivetrain
Automatic and manual diesel transmissions, differentials, and transfer cases. Built to handle torque, not just survive it.
Electrical & Diagnostics
Advanced scan tools, wiring repair, and module programming. If it's got a computer, we can talk to it — and figure out what it's saying.
142
Built on
honest work
honest work
About Us
We don't build websites.
We build trust — one truck at a time.
142 Diesel Performance started with a simple frustration: too many diesel owners get told they need a part they don't. So we decided to do it differently.
Every job that comes through our bay in Terrell gets the same treatment — thorough diagnosis, clear communication, and work we'd be proud to put on our own rigs. That's not a slogan. It's the reason we've kept our doors open and our customers coming back.
Whether you're hauling for a living or just refuse to drive anything less than a diesel, we treat your truck like it matters. Because it does.
No Surprise Bills
We explain before we touch.
Real Diagnostics
We find the root cause, not the symptom.
Local & Honest
Terrell-based. Reputation is everything.
Why 142
The difference isn't in our equipment.
It's in our attitude.
100%
Honesty Rate
We'll tell you if your truck doesn't need that upgrade. Most shops won't.
All Makes
Diesel Specialists
Cummins, Power Stroke, Duramax, 6.7L Power Stroke — we speak every diesel language.
Local
Right Here in Terrell
FM 2728. Not a franchise. Not a call center. A real shop, real people.
Clear
No Jargon Policy
We explain what's wrong in plain English. You decide what gets done.
Our Work
See it in the bay
Real trucks. Real jobs. No staged photos.
Performance build in progress
Turbo & intake work
Our Terrell bay
Advanced diagnostics
Another one road-ready
What Drivers Say
We let the trucks do the talking
Finally found a shop that doesn't try to sell me stuff I don't need. They fixed what was broken, told me what I could wait on, and charged me exactly what they said. That's rare.
Had my 6.7 tuned and the difference is night and day. They explained everything they did and didn't try to upsell me on a second stage. Honest people run an honest shop.
They got me back on the road the same day instead of trying to stretch the job. That's the kind of place you hold onto in this area.
Ready to get your truck running right?
Stop driving on guesswork.
Start driving on knowledge.
Bring it in or give us a call. We'll tell you what your truck actually needs — not what someone else would have you believe.
Get in Touch
Let's talk about
your diesel
Whether it's a question, a repair estimate, or you just want to know if we can help — reach out. We respond fast.
