Services About Why Us Contact (765) 432-8972
Kokomo's Trusted Diesel Shop

Your Diesel Deserves
More Than a Tune-Up?

From routine maintenance to full performance builds — we diagnose what others miss, build components that last, and deliver results you can feel on the road.

Call (765) 432-8972 Explore Services
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What We Do

Comprehensive Diesel Services

Every service is performed with precision equipment and deep manufacturer knowledge — so your truck runs at its best, season after season.

Engine Diagnostics & Repair

Advanced scan-tool diagnostics paired with hands-on expertise to pinpoint and resolve issues — from rough idles to complete overhauls.

Performance Tuning

Custom ECM programming for more torque, better fuel economy, and smoother power delivery — tailored to how you actually drive.

Turbo & Exhaust Systems

Turbo rebuilds, replacement, and custom exhaust fabrication — from street builds to show trucks, we handle it all.

Pre-Purchase Inspections

Buying a used diesel? We'll give you a thorough, honest assessment so you know exactly what you're getting before you commit.

Fluid & Filter Service

Oil changes, DEF system service, fuel filter replacements, and coolant flushes — the fundamentals done right, on schedule.

Transmission & Drivetrain

Transmission builds, clutch replacements, and differential service — keeping your power delivery smooth and reliable.

Lesley Performance Diesel workshop interior with tools and equipment

Kokomo's

Go-To Diesel Shop

About Us

Built on Hard Work,
Driven by Precision

Lesley Performance Diesel was founded on a simple belief: diesel trucks deserve mechanics who actually understand them. Too many shops treat a Cummins, Duramax, or Power Stroke like a half-size V8 — and the results show.

We specialize in the systems that matter most — fuel injection, turbocharging, ECM tuning, and heavy-duty drivetrains. Whether you're hauling heavy, towing long, or building for the street, we bring the same level of care to every job.

All Makes

Cummins · Duramax · Power Stroke

Every Use

Daily Driver · Work Truck · Show Build

Why Choose Us

The Difference Is in the Details

Honest Assessments

We tell you what your truck actually needs — not what sounds expensive. No upselling, no guesswork.

Detailed Estimates

Transparent pricing with itemized quotes before any work begins. You always know the cost upfront.

Quality Parts

We use reputable brands and OEM-equivalent components — because cheap parts cost you more in the long run.

Direct Communication

You'll speak with the person working on your truck — not a service writer reading from a script.

Diesel engine bay close-up
Turbocharger component
Performance tuning equipment
Truck on lift in workshop

Get in Touch

Ready to Get Your Truck Running Right?

Visit Us

13062 S 150 E
Kokomo, IN 46901

Call Us

(765) 432-8972

Send Us a Message

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