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  1. Gauges, Electronics and Wiring.
    Putting together a "Frame off build" for a customer. The Truck was torn apart by different shops but in boxes to never be assembled again. I Inherited this project as a bare frame with axles and many boxes with parts. Since then I have assembled a lot of the truck and have the cab and all the...
  2. General Discussions
    What is the true value of a 2006 LBZ duramax clean no rust, basically unicorn truck, all the options, with 50k miles? Some ones you find on classic truck traders want close to 50 grand. What do these things really sell for? 30?
  3. 04.5-05 LLY Duramax Powertrain
    Hello all, this is is first post on this forum as well as my first diesel. My 05 lly makes this weird noise after warming up and wondering if this is cause for concern. Only mods are intake boot, downpipe, and exhaust. Truck drives fantastic and no other concerns or issues other than this...
  4. 04.5-05 LLY Duramax Powertrain
    I am in the process of finishing up a rebuild on my truck after sitting disassembled for about 4 years. It cranks fine but never hits a lick. The primer will get hard like it's primed until you crank it and it's soft again. I've replaced the filter head, bypassed the fuel lines by running a...
  5. Drivetrain
    So i have a 2004.5 lly duramax and since i bought it the lights for the 4wd buttons have not been on. One time on the highway i had to step on it and they turned on but quickly turned back off. Then again i was stuck and they turned on but a service 4wd came on. I read some other stuff and i...
  6. Performance Upgrades
    Does it fit? There is mouthpieces in Amazon and eBay for LLY and its easiest way order things to My country
  7. New Member Introductions
    Hey there, I have been trying to figure this out in forums and through other duramax enthusiasts. I bought a 04.5 2500HD LLY Duramax back in May 240,000 KM, very clean inside and out, bought it from a dealer where i buy all my vehicles from. Anyways at the time of purchase I was told i needed...
  8. 911 Problems Forum
    2005 LLY bought the truck non running people I bought it from said it was starting on ether then one day wouldn’t start no more just cranked and cranked, ran the codes comes up U0105 (No communication with FICM) pull FICM sent to SIA for rebuild they rebuilt it said it had bad capacitor load...
  9. General Discussions
    truck is a 2005 GMC 2500HD LLY 5spd Allison, not tuned to my knowledge, cold air intake, egr delete and 5” straight pipe from down pipe back. Just bought the truck a couple months ago with 270k, displays 1400 engine hours but I know that cannot be trusted. I’ve put on around 5k highway miles on...
  10. 04.5-05 LLY Duramax Powertrain
    On Going Issues With P2149, P0202, P0203 and P0208 codes. The problem started with the engine going into “limp” mode and throwing codes P2149, P0202, P0203 and P0208. I replaced the #2 pigtail and still had the problem so I swapped the FICM from another truck along with the filter head. It...
  11. General Discussions
    The truck will shift into 4 high no problem, but won’t come back out no matter what I try. Won’t even shift into 4 low. The only way I could get it out of 4WD is to drive about 15 min then shifts back to 2WD
  12. 04.5-05 LLY Duramax Powertrain
    I’ve got an 05 duramax 2500hd lly. 150kmiles. Just before this started it was having trans overheating troubles. I cleaned the small trans cooler up front, dropped the oil replaced the external filter, cut the old filter up to check for debris(clean). Took it in for a service they found the area...
  13. 04.5-05 LLY Duramax Powertrain
    Hi, I have a 05 LLY Duramax with 286,000 km (177,000 miles). The top end was pretty much rebuilt last winter due to broken glow plugs...the heads were taken off in order to remove the broken glow plugs. While they were in there, they replaced the head gaskets, put in gatorback head studs, mbrp...
  14. 04.5-05 LLY Duramax Powertrain
    Hey all. I have an 05 lly 05 gmc sierra. truck has 382,000kms The other day I was driving and came to a stop at a light and there were puffs of a blue whiteish colour of smoke. Truck still has lots of power. I have a p0304 code, only smokes at idle for a couple seconds after driving and then it...
  15. 04.5-05 LLY Duramax Powertrain
    I have a 2005 LLY that's having weird intermittent rough idle and intermittent surging. I recently changed the FPR (OEM Bosch) a few months ago and my desired FP is matching to actual pressure. When checking balance rates, at idle, all injectors intermittently go to 0 simultaneously. I have a...
  16. Performance Upgrades
    Is there a way I can get my banks six gun chip to work without the switch, I don't have the switch or an iDash
  17. Performance Upgrades
    I got a 2005 LLY duramax, basically stock except for a banks air intake. I wanna get 45 over injectors for more power and smoke but I also don't wanna tune it or get a new fuel pump. Will 45 overs be too big for that or should I get smaller ones?
  18. General Discussions
    Good afternoon everyone. Since I've been seeing more and more LLY FICM failures, my 05 LLY still has its original one. It's getting to the point where Im going to tackle the "Updated" and newer capacitors to prevent a possible $1500 bill but I want to learn myself vs having someone else do it...
  19. 04.5-05 LLY Performance Parts Discussion
    Hi new to this site but was hoping to get some help. I have a 2004.5 LLY duramax I recently did the head gaskets so I decided I would upgrade some other things while in there to get more performance. I installed PPE high flow exhaust manifolds with new high flow up pipes, 4" down pipe, deleted...
  20. Transmission Shop
    Can I swap out my Alison 1000 for a more durable and stronger 4L80? Or do I have a better option for the money or what are my options? Thanks in advance
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