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Duramax Second Generation: 2004.5-2005 (LLY) Discuss the second generation (2004.5-2005 LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion belongs in Third Generation forum due to the differences of the 2006 LLY and the 2004.5-2005 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 02-18-2013, 10:16 AM   #1 (permalink)
Diesel Master
Join Date: Jul 2005
Location: Orange County, CA
Posts: 1,395
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How many miles on your truck without engine issues?

Just wondering how many Duramax diesels are out there that have run thousands of miles without any engine issues such as water pump or head gaskets, etc.

If you've had no issues so far, post the miles on your odometer, please! Let's see how many trouble free trucks there are!

Mine: only 80,000 so far, but no issues.


05 Silverado 2500HD LB, CC, 4x2, LLY, Allison, Allison Deep Pan, Scangauge II, EGR Blocker, PCV Reroute, Nicktane Aux Fuel Filter w/CAT 1R0749 filter, DiPricol Pyro & Boost, PowerSteps, TxC CAI, Fan Damn, RadMod V2+Fan, Induction Overhaul Kit (LBZ MP), Coolant Filter System, Nicktane OEM Filter Adapter+CAT 1R0750 fuel filter, LT285-75-16 on PYO's. Running Rotella T6 5W-40.

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Old 02-18-2013, 10:29 AM   #2 (permalink)
Diesel Technician
Join Date: Jan 2013
Location: Oak Creek, WI
Posts: 250
iTrader Score: 0 reviews

I'm at 91,000, only having issues with the turbo vane position sensor.

2005 LLY ECSB 4x4
Silverline 4" and cat delete / EGR blocked and PCV reroute / S&B turbo mouthpiece and K&N drop in air filter / Nicktane filter adapter with Cat IR-0750 filter / Bully Dog Triple Dog GT / 2" suspension level / Bilstein 5100's / Caltrac's / Leveled 06+ towing mirrors / Fuel wheels with Cooper Zeon LTZ 305-55R20 / Braided stainless steel brake flex lines / A crap-ton of various electronics from Pioneer, Viper, iDataLink, PAC-Audio, Autometer....etc
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Old 02-18-2013, 01:24 PM   #3 (permalink)
ratchet196's Avatar
Join Date: Jan 2007
Location: South Central Ohio
Posts: 60
iTrader Score: 0 reviews

45,000 miles

Engine - fuel pressure regulator

Trans - front pump seal

rear axle seals
2005 CHEVY 3500 LLY DRW CC/LB 4WD LT EDGE EVOLUTION CTS (Meyer Performance) LINEX BED-TUBE STEPS-SILVER Activator II Brake controller,Aux-Box, Ipod, MBRP Cat Back Stainless 5 in tip (MEYER PERFORMANCE) Cat removed, PPE False code eliminator,. LBZ Mouthpiece, 3/10 38500 miles. 11/10 41500 4/11 42167 5/12 44385 2/13 45218 1/14 47705 4/16 50685
Edge Backup camera
2000 Chevy 2500 EC/LB 6.0 3.73 LS Boss 7.5 Plow 89,000mi 1/14 100000 4/16

2013 Keystone Sprinter 311bhs
B&W Gooseneck Hitch
John Deere in Garage (mower) X749 DIeSel
John Deere 07 110 TLB
Dually Club Member #430
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Old 02-18-2013, 01:29 PM   #4 (permalink)
Diesel Specialist
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Join Date: Nov 2011
Location: Minneapolis, MN
Posts: 1,202
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I wish I could join this club.
I am interested to see the highest millage with stock head gaskets.
2005 Black GMC Sierra 2500HD SLT - CCSB
AUX Radio Input (iSimple ISGM535) - High Idle Mod - Head Gaskets (June 2012@149K) - OEM Cab Lights - LBZ Mouth Piece - All On Headlight Mod - Puddle and Footwell LED's - OEM Towing Mirrors - Uniden BCT15x Scanner - Gauges in Trippin' Overhead mount - Rigid Industries Dually Backup Lights - UC6 radio with LUX amp
-Stock tuning and staying that way

LBZ door badges, Kennedy lift pump, aux CAT filter
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Old 02-18-2013, 01:51 PM   #5 (permalink)
Diesel Technician
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Join Date: Oct 2007
Location: N.W. Ohio
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240,000. Havent touched the engine, except the idler pullies, belt, and thermostats at 150,000, just cuz I thought I better. It needs 2 new injectors, but still gets 17 mpg with 33 in tires. The Duramax has been FLAWLESS, no complaints! The Allison on the other hand is a different story. Its about ready for its 2nd rebuild. P.S. It still has the original front suspension parts, minus 1 front wheel bearing.
  • 2005 GMC 3500 Dually. MBRP 4 inch turbo back, Autometer Boost, Pyro, and Oil Press. on the A-pillar. Predator programmer 285/75/16 All Terrain tires (with 1.5 spacers)Proud member #701 of the elite Dually Club. 1980 Malibu Drag car. 548 ci. BBC, Turbo 400 with transbrake, 33x17 Goodyear slicks. 9.50@141mph. Gonna spray it later this year and go 8.50's

Last edited by Stroker548; 02-18-2013 at 01:59 PM.
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Old 02-18-2013, 03:55 PM   #6 (permalink)
Diesel Head
Join Date: Apr 2005
Location: Bay Area, CA
Posts: 28
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60,150 miles, no engine or tranny issues. Just the steering intermediate shaft fixed.
2005 Silverado 3500 LT, CC DRW 4WD LLY
AFE MP, Ride-Rites, Rancho 9000, Line-X
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Old 02-18-2013, 04:25 PM   #7 (permalink)
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Join Date: May 2010
Location: Kent Co. Delaware
Posts: 10,074
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DelMarVa Diesel Club Member Lifetime Premium Member

75,000 miles and the only real problem has been the drivers side wheel bearing. Of course there's been a bunch of wearable items like the brakes, batteries, and shocks. My biggest complaint right now is my seat heaters stopped working
>2005 Chevrolet 2500HD CC SB 4X4 Duramax LLY/Allison<
MBRP 4" w/6" Tip, MBRP Downpipe, EGR Blocked (FE9 Emissions), PCV Rerouted, Resonator Blocked, AFE MP, Edge CTS Insight, Banks Intake w/Scoop, Nicktane Adaptor w/CAT 1R-0750 Filter, Bilstein 5100's, 2006+ Tow Mirrors, GM Tubular Chrome Step Bars, GM Bug Guard and Window Shields, Line-X Spray in Liner, Dually Rear Light Bar, 265/75R16 Goodyear Silent Armors on stock rims, Superglide 16k Fifth Wheel Hitch, Tekonsha P3 Brake Control

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Old 02-18-2013, 06:02 PM   #8 (permalink)
Diesel Rookie
Join Date: Dec 2006
Location: Coeur D'Alene ID
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76k. I've done both front wheel bearings, FPR and 2 and 7 fix.
2004.5 Chevy 2500HD LLY CC SB
Edge J/A, egr blocked, Cat delete, MBRP 4inch, K&N intake, AFE turbo mouthpiece, Westin brush guard, Snugtop canopy, 103k
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Old 02-18-2013, 07:39 PM   #9 (permalink)
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Location: Burlington,ON/Frdericton,NB
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Ontario Diesel Place Chapter Member

On my LLY I was at 160k miles when the head gasket went. about 140k for the glow plug module.
2011 - LML Sierra CCSB
285/70/17 - Goodyear Duratrac
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Old 02-18-2013, 07:41 PM   #10 (permalink)
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Formerly my03diesel
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Location: Mass
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How many miles on your truck without engine issues?

My dads 04 LLY...90k...brakes so far that's it..

Sent from App

2008 GMC Sierra 2500HD SLT CC/SB
Gray, Black Leather, BOSE, Nav, Roof
4" MBRP Stainless Filter-Back,
Tint, Strobes,
6000K HIDs Low and High Beams,
6000K Fogs, All LED Interior,
Linex, BackFlip tonneau...
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