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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 06-22-2010, 02:26 AM   #1 (permalink)
Maine Towing
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Do I have an LLY or LBZ?

Can anybody tell me how to identify the engine in my new to me 2006 Chevy 3500 DRW? I don't know if it has the LLY or LBZ package - all I know is that is has insane power compared to my old truck. Thanks

2006 Chevy Silverado LT 4, LBZ, 4WD, Crew Cab, DRW, 6 speed, spends her life with a 7 horse trailer hitched in the bed.
100 gal Trans-Flo aux tank
B+W Turnover mount, EGR blocked
EFI Live by "Idaho Rob" w/ DSP 5
Lift Pump at 175,000 miles, CP3 at 299,000
ALL ON MOD - credit to GMC2500HD - best $1.29 mod you can get !!!
Air box mod
Wicked hot wife
4" Flo Pro exhaust, down pipe back, cat was stolen by some scrap iron punks That's my story and I'm sticking to it!!!

Official member of the over 300,000 mile club.

Proud Member #880 of the 3500 DUALLY CLUB
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Old 06-22-2010, 03:34 AM   #2 (permalink)
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check the 8th digit of the vin or check the glove box, there will be a code saying which engine you have

2006 CCSB LT3 LBZ pro comp 6" lift, 315's exhaust Banks 6-gun PDA, Frontier front bumper, HIDS, etc.
2004 Toyota 4runner 3" lift on 285's
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Old 06-22-2010, 09:05 AM   #3 (permalink)
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Easier way -- look at the emblem on the door. If it says "DURAMAX Diesel" it's an LLY. If it says "Allison DURAMAX" it's an LBZ.
2006 GMC Sierra LBZ 2500HD SLT ECSB 4x4 (Stealth Gray, Leather, Sunroof)
- EFILive by Duramaxtuner / Banks Techni-Cooler intercooler / aFe intercooler tube
- PPE Ported Fuel Rail Fitting / BD manifold / MBRP 5" downpipe-back exhaust
- ATS Five-Star Torque Converter / TransGo Jr / Fluidampr
- FS-2500 oil bypass filter / Lubrication Specialist auxiliary fuel filter
- Bilsteins / Hellwig front bar / Cognito Pitman/Idler Arm Support Kit and Heavy Duty Tie Rods
- Aero Tanks 48-gallon replacement fuel tank (doesn't extend below frame rail)
- Line-X / UnderCover tonneau cover
- CalTracs traction bars
- LT285/60-18 Nittos on 18" x 9" Centerlines
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Old 06-22-2010, 01:13 PM   #4 (permalink)
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8th digit of the vin will tell you.
if it's a "2" it's a lly
if it's a "D" it's a LBZ
2006 Chevy LBZ 4X4 Crew Cab Dually
265-75-16 BFGs
3500 Dually Club Member #804
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