GM Trucks & SUVs · Silverado/Sierra HD & Duramax
Silverado/Sierra HD & Duramax Transmission Repair in Kern County
The 2500 and 3500 HD trucks, especially behind the Duramax diesel, work harder than any half-ton. If your HD truck is slipping under load, shuddering, or overheating from towing, we build these back stronger, since 1956.
Diagnostic board
Signs your Silverado/Sierra HD & Duramax transmission needs attention
These are what you searched for. If your vehicle is doing any of them, don't wait, small issues get expensive fast.
Slipping under load
Especially towing heavy.
Torque-converter shudder
A classic Allison and 6L90 symptom.
Overheating
Cooked fluid from towing in the heat.
Harsh shifts
Valve-body wear.
No movement
Internal failure.
Warning light
Transmission-temp or check-engine light.
Noticing any of these? Get a free diagnostic before it gets worse.
Which transmission is in my Silverado/Sierra HD & Duramax?
Reassurance and expertise, not a spec sheet. Not sure which you have? Give us the year and engine.
Allison 1000 (5/6-speed)
- Model years
- 2001-2019
- Engine
- 6.6 Duramax
6L90 (6-speed)
- Model years
- 2007-2019
- Engine
- 6.0 gas
Allison 10-speed
- Model years
- 2020+
- Engine
- 6.6 Duramax
Give us the year and whether it's gas or Duramax, we'll confirm it.
Common Silverado/Sierra HD & Duramax problems, and how we fix them
The Allison 1000 is a stout unit, but hard towing and high mileage bring torque-converter shudder, overheating, and valve-body wear. In a rebuild we upgrade the weak points and improve heat management so your HD truck comes back ready to work.
What success looks like
Diagnosed honestly, fixed right, back to work fast.
Kern County's Ag, water, and commercial fleets run these HD trucks hard. We offer priority scheduling and free towing to keep them earning.
You're covered
We stand behind every repair.
When you trust us with your transmission, you're protected. We've stood behind our work for three generations, and every repair is backed by our warranty.
Real reviews from Google & Yelp
Kern County has trusted us for 70 years.
Worst-case rebuild, and they had it done in a day and a half. The guys worked late and came in early to get me back on the road.
Frequently asked questions
Common questions about Silverado/Sierra HD & Duramax transmission repair.
It depends on the year and engine. Give us those and we'll confirm the exact unit, no guesswork.
Tell us what you're driving. We'll take it from there.
Book your free diagnostic in under a minute. Only your name and phone are required, and the slot is yours as soon as you submit.
Free diagnostic, no obligation. Warranty honored at all 5 locations.