Diesel Transmission Service & Repair

Ford PowerStroke, Dodge Cummins & Chevy Duramax — Rancho Cucamonga, CA

From a simple service to a ground-up rebuild, we've got your transmission covered.

A diesel makes big torque, and the transmission takes the hit. Whether yours is slipping, shifting hard, or due for service, we fix it right — automatic or manual.

714-470-7478 · 8880 Archibald Ave Unit H, Rancho Cucamonga, CA 91730

Your transmission works as hard as your engine — harder, when you're towing. Slipping gears, harsh or delayed shifts, a burnt fluid smell, or a warning light are all signs it needs attention before a small problem becomes a rebuild.

We service, rebuild, and replace automatics and manuals, and we diagnose carefully before we recommend anything. If a fluid service and shift kit will fix it, that's what you'll get — we don't sell you a rebuild you don't need.

»  Digital Inspections Now Available

Buying a used diesel? Get a full pre-purchase digital inspection — photos included. We walk the truck bumper to bumper and send you a clear, itemized report straight to your phone, so you see exactly what you're buying before you sign.

Ask about a pre-purchase inspection → 714-470-7478

 

 Diesel Truck Transmission Services

Fluid service, shift kits, rebuilds, and replacements for automatics and manuals — built to hold up to diesel torque.

  • Automatic transmission fluid service
  • Automatic transmission rebuilding
  • Automatic transmission replacement
  • Automatic transmission coolers
  • Shift kit installation
  • Warning light diagnosis
  • Manual transmission service & replacement
  • Manual transmission clutch service & replacement
  • Transmission mount replacement
Diesel Truck Automatic Transmission Service

CAREFUL DIAGNOSIS

Diagnose First, Then Fix

A transmission rebuild is a big ticket — so we make sure it's actually needed.

We diagnose the real cause before we recommend the repair, so you're not paying for a teardown when a service would've done it.

Done right the first time, never rushed.

Transmission Service Mad Tech Diesel Rancho Cucamonga

PARTS & WARRANTY

OEM Parts, Backed in Writing

  OEM parts only, covered by a 2-year / unlimited-mile warranty
  NAPA parts covered by the NAPA 12-month / 12,000-mile warranty
•  All OEM filters in stock and a large parts inventory — less downtime waiting on parts

Let's Diagnose It Right

Call Mad Tech Diesel Workz and get a straight answer from a shop that specializes in diesel.