GMC / Chevrolet 6.6L Duramax V8 Tuning
Model years 2001–2016
6.6L Duramax V8 diesel (LB7, LLY, LBZ, LMM, LML) in GMC Sierra and Chevrolet Silverado heavy-duty trucks, 2001–2016, and the Chevrolet Express van, 2006–2010.
Compatible models
- GMC Sierra 2500HD / 3500
- Chevrolet Silverado 2500HD / 3500
- Chevrolet Express (2006–2010)
$999
Book now
How your GMC / Chevrolet 6.6L Duramax V8 appointment works
- Check your truck. Pick your model year above, or enter your VIN. We'll tell you straight away whether your 6.6L Duramax V8 is on our supported list.
- Request a day and time. We're open Monday to Friday, 9 AM – 5 PM. Full days are greyed out.
- The shop confirms. We review your request and contact you by email or phone. Nothing is booked until we confirm.
- Bring your truck in. Plan for about 1–2 hours at the shop.
6.6L Duramax V8 engine codes by year
The 6.6L Duramax V8 went through several versions in this period. If you're not sure which one your truck has, the VIN lookup or your build sheet will tell you; the 8th character of the VIN identifies the engine.
| Engine code | Pickup model years |
|---|---|
| LB7 | 2001–2004 |
| LLY | 2004.5–2005 |
| LBZ | 2006–2007 |
| LMM | 2007.5–2010 |
| LML | 2011–2016 |
We tune all of these generations.
GMC / Chevrolet 6.6L Duramax V8 tuning FAQ
Which GMC / Chevrolet model years do you tune?
We tune the 6.6L Duramax V8 in 2001–2016 models: GMC Sierra 2500HD / 3500, Chevrolet Silverado 2500HD / 3500, Chevrolet Express (2006–2010). If you pick a year outside that range, the form saves your details as an inquiry instead of a booking.
How much does it cost?
Tuning is $999. Payment is not taken online; booking is a request only.
How long does the appointment take?
About 1–2 hours. Appointments start between 9 AM and 3 PM, Monday to Friday.
Is my appointment confirmed as soon as I book?
No. Every request is reviewed by the shop first. You will be contacted by email or phone, whichever you choose, once it is confirmed.
Do I need my VIN?
No. The VIN lookup is optional. It fills in your truck details and checks the engine against our supported list, but you can simply pick your year.
What if my truck has other modifications or an existing tune?
Mention them in the Notes box when you book so the shop knows before you arrive.
What if my truck isn't listed?
Use Find your truck to send us the details. We will keep them and let you know if we can help.