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  1. Allison Aftermarket
    Anyone please help us! 03 Lb7. Built trans, lift pump, Triple disc, Dan's Tcm, reputable tune. It has shifted horribly hard from 3-4 over 70% throttle since built. I'm talking tailgate flops down, about hops off the ground. The builder has pulled it twice, second time new core, new valve body...
  2. Allison Aftermarket
    I'm about at my whits end with my built trans. Had it built in March of 2022 and ever since I've been chasing a leak from the bellhousing area. Shop that built it had been great about trying to fix it under the warranty but it still leaks. They resealed the whole trans the last time they had the...
  3. Maintenance & Fluids
    I have the 2016 Chevrolet Silverado 2500HD Duramax/Allison with over 100,000 miles. Would it be benefit to switch to synthetic. All previous oil and changes have been done at dealerships across the nation.
  4. Duramax Fourth Generation: 2007.5-2010 (LMM)
    07 chevy duramax lmm crank but no start seems to be no injector pulse. checked wiring seems fine have crank and cam signal. fuel pressure reading seems fine on scanner. thought it was possibly ecm replaced with new and still having same issue? please help thanks
  5. Allison OEM
    My transmission is overheating when I drive around town or stopping and going on the highway. When I get up to speed (65+ MPH) it seems to maintain regular operating temp. I've replaced the fluid and external transmission fluid filter. The trans cooler seems to be in good condition. The truck is...
  6. 3.0L Duramax
    Looking into an exhaust system for a 3.OL Duramax AT4 - Can anyone point me in the right direction? Looking to add a little more noise. Not necessarily doing it for for extra Torque or Horsepower.
  7. Duramax Third Generation: 2006-2007.5 (LBZ & LLY)
    07 lbz gmc 2500hd I have been getting engine reduce power only when it rains or snows bad checked air filter seems dry I have read on here someone put there ecu in a trash bag and taped it solved the issue but what’s the actual fix for it and is it a common issue
  8. Drivetrain - 2001 - 2010
    I'm asking for my son..please no judgement. He has an 04 duramax. His drive shaft completely disconnected in the front when he was driving. If the drive shaft is disconnected from the rear as well can he drive it as a 2WD front or rear? If so, how does he go about that? Is there anything he...
  9. Duramax Second Generation: 2004.5-2005 (LLY)
    new to this form and duramax’s lol but i recently bought one in tractor mode and have been going through all the ice picking and replacing pig tails and checking the ficm bracket by the alternator and a couple other spots i’ve seen through these forums but the weird part about it is i have no...
  10. Duramax Fifth Generation: 2011-2016 (LML)
    So my lml engine has blowby and I have a good lmm spare engine with no use for it. My question is can I take the heads off my lml and bolt them to the lmm shortblock? I know the injectors are different, so using the lml heads would allow me to keep the lml injectors then I wouldn’t have to deal...
  11. Duramax First Generation: 2001-2004 (LB7)
    Hi! So, I’ve got an 02 duramax with a white smoke problem that I’m at my whits (and my wallets) end with. Started this spring when my injectors went bad, tons of white smoke both at idle and under throttle. Replaced them all. Week or so later the injector pump, week or so after that the lift...
  12. Duramax Fourth Generation: 2007.5-2010 (LMM)
    I have a 08 lmm duramax 4wd been in the shop for months now fixing all the bs I got stuck with when buying the truck but my mechanic is telling me truck keeps throwing a ground g code he replaces bunch of parts he got it started and drove it for about 20 miles before that code comes up again he...
  13. Introductions & New Trucks
    Hey guys, got a killer deal on a truck that needs head work and a body. Deal was so good he told me to come Fri-sunday or he'd sell it to someone else. I was there (5.5 hrs away) at 8am Friday to load it. :love: Its one of the fastest trucks Ive ever drove and its terrifying because it needs so...
  14. Wheels & Tires
    Howdy guys/gals. What is the biggest tire I can run on my 2020 without any suspension modifications? Thanks in advance for any and all assistance.
  15. Duramax Sixth Generation: 2017-2019 (L5P)
    So I lost my dream truck to a crash. Even the dog is trying to figure out what happened. My second day out on a two week trip. Wife fell asleep and overcorrected just east of Billings Montana on I 94. Thank god for air bags and seatbelts, no one was hurt. If anyone needs a used Duramax diesel...
  16. Duramax Fourth Generation: 2007.5-2010 (LMM)
    So I keep getting a change fuel filter on the DIC. I’m unsure of what’s going on it’s a 2008 deleted with a fassfuel, running on a single tune sometimes it will go into reduced engine power due to this filter had 5000k miles replaced earlier today with a new one but same issue anything??? I’m...
  17. Allison OEM
    Its been a while since I've posted anything here on this revamped board. So here goes: Truck has: 595,750 kms Deep Pansince Apr 2007 Transynd since Apr 2007 TransGo Jr since Apr 2007 Ally has been serviced with new internal filter 4 times since I've owned it. Change spin on with every oil...
  18. Towing
    Looking at possibly switching to a bumper pull one day from a 5th wheel set up. I've been looking at 2 and now 3 hitches and am wondering anyone on here has real world experience and an educated opinion on either one or all of them. The hitches I've so far been considering are.... 1 : CURT...
  19. Duramax Fifth Generation: 2011-2016 (LML)
    Hey guys first with this please be patient i have 2015 duramax the wif light came on so i went to the parts house got a new filter and before i made it home truck went into limp mode i think it runs fine but limited to 2000 rpm i changed filter very little water in it but i got p008 code low...
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