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  1. Wheels & Tires
    I got a 2005 LLY GMC 2500 and I want to put 14 wides on it. It is leveled but that’s all. What size wheels could I clear without doing little to no trimming on a level and does anyone have any recommendations for a lift? I’d only run the wides on occasion and run my regular wheels mostly so I’d...
  2. 2020+ LM2 Duramax Powertrain
    Hey guys, Wondering what the stages are for the Emissions Derate. How many km/miles are you allowed to go at each speed reduction. Looking at getting a new AT4 but I do a lot of long trips to the mountains with my current truck (pre emissions) and that’s a fear of mine is it ruining a trip...
  3. General Discussions
    Do they make a tuner for the new 2023 GMC Sierra 1500 AT4 Diesel LZ0 engine?
  4. General Discussions
    I’ve been deciding if I wanted to post on here. but screw it. Least I might have my questions I want answered. I have a Stock LB7. I want to do up the motor & transmission. has 340xxxkms. So it’s time. I was originally gonna due up the motor but I know the transmission would go as soon as I...
  5. 06-07 LBZ & LLY Performance Parts Discussion
    Hi Everyone, first post so hopefully in the right place. I have a 2007 LBZ CC SB. Since buying it, its struggled to ever maintain operating temperature, it will hit the 100 mark when accelerating hard or climbing hills but will immediately drop the the quarter mark after, it stays at this point...
  6. Parts For Sale
    Hey fellas , I have some parts new and used from my 2016 Denali 2500 Taking offers on all , i will sell new parts cheaper then msrp and ill ship anywhere 1 - Dmxstore xd heavy duty lower control arms - Brand new 2- used kryptonite upper control arms 10k miles good condition 3- used Fox...
    $100 USD
  7. General Discussions
    Hi all, I just picked up a new webasto coolant heater and 7 day timer for my 2020 GMC AT4HD. Has anyone done this install on their 2020+ L5P’s? Looking for any insight on whether I should get it professionally installed or do it myself as a DIYer. The cost of labour is practically the same...
  8. Exterior
    My 2015 styles on my 2005 GMC sierra 2500 are hitting the door now after attempting to level. They didn’t hit the cab before but now when I fold them they hit the door. Thinking it was something with them being leveled, I unleveled them, but it still hits the door when I fold them and it seems...
  9. Turbo's Stock and Aftermarket.
    I just bought another 2006 lbz completely stock and the Downpipe clamp broke off the turbo I can’t find the stock size and I can’t get in there right now to figure it out with my back being messed up anyone know
  10. Towing & Hauling
    Hey everyone! Have a question. I wanna put my 2500 duramax to work and make some money but, I'm not to entirely sure if legally it can haul per DOT regulations regarding weight. The gvwr is 9900 lbs steer axles 5900 and the drives are 6200. Any help on the matter would greatly be appreciated
  11. Parts For Sale
    GMC Sierra All Terrain grille, OEM, Onyx black, Red emblem, 2015-2019, 2500/3500 Mountains 2 Metal GMC Sierra bumper grille insert, black, plain rectangles, 2015-2019, 2500/3500 Normal wear (Located in West Palm Bch, FL)
    $0 USD
  12. Wheels & Tires
    Got a 16 2500 completely stock everything but wanting to buy some 24x14 on 35x13.50r24 but don’t really wanna get a level or little lift just yet but I’m wondering if it’ll fit or rub since I have some 35s mud grapplers on them right with stock wheels now and I don’t rub any help or advice is...
  13. Competition
    So I got a 2005 LLY duramax GMC and the county fair is coming up quick. I want to put it in the truck pulls. I’ve heard that they can be a little loose on the front wheel bearings. Is that true?
  14. Aftermarket Mods.
    hey I've had this pickup (2002 lb7) for I want to say about 2 years now. I want to upgrade my tuner I have a edge attitude it's a grey one I don't really know if I'm right on what I have so that's why I include the color. I want to get the edge evolution cts3 would this be a worth while upgrade...
  15. 911 Problems Forum
    hey i have a 2009 chev 3500 diesel, recently it has been giving me random issues shifting, if you come to a stop and go to take off it sometimes shutters & doesn't want to get going, i've also had it going down the highway not able to go over 60mph while pressing the pedal further it continues...
  16. Maintenance
    I have an 2009 GMC Sierra extended cab long bed. It’s completely stock bought it recently at 197000 and it’s only at 199k. I bought it and the first week ran like a beast. It was quick compared to my old gasser. Then I started noticing lack of power and low mpg. Then the efr code popped up and...
  17. For Sale L5P ECM

    Parts For Sale
    Factory New ECM, E41 from GM Ecm has no programming on this one. it will need to be programmed for your L5P or sent off to be unlocked. Call or text 850-819-8315
    $1,000 USD
  18. General Discussions
    I have a 13 GMC Sierra 3500hd SRW. It has some missing parts and a 150hp single tune in it. I bought it 2 years ago with the upgrades from a dealer. It has been running like a champ until my TCM went out a couple months ago but got one overnighted to me from Dan's Diesel Performance with the...
  19. Interior
    Goodmorning everyone, I have a 2005 gmc duramax. It recently started to beep after key is removed and I exit the car I can still hear the beeping outside.. any ideas
    gmc
  20. 04.5-05 LLY Duramax Powertrain
    I was leaving work today and was coming up to speed on the freeway and I heard a loud release of air pressure and suffered a total loss of Turbo pressure. I was not pushing the gas all that hard and was not all my stock gauges appeared to be normal. The check engine light did not turn on. I...
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