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  1. J

    Rear Diff Fluid Change

    Getting ready to change the fluid in the rear diff. It’s weeping oil both front and back so I’m assuming changing the pinion seal as well would be a good idea. the LLY has 150k miles on it and I don’t know it’s history more than the better part of the year so it’s cheap insurance. What fluid...
  2. J

    Boost Leak

    I bought a boost tester just to have and popped it in to see and found out I have a boost leak. Here’s a video in real time so you can see. I don’t know how bad this is but 20 psi leaks out to 0 in about a minute and a half. I was able to trace the sound to I think right at the intake. It was...
    • Jake707
    • Thread
    • Replies: 2
    • Forum: LLY
  3. J

    Trans Service Advice

    I’m getting ready to change the fluid in my LLY trans. I don’t know if/when it’s been done so I’d rather just know it’s been changed and good to go. I have 3 gallons of Transynd fluid, the internal filter, pan gasket and external filter with new magnet. Anything else I should need or check...
  4. J

    Cab Isolators

    I have an 05 crew cab and saw a couple videos of people changing out the cab mounts to hydraulic type isolators, some just did the back two mounts and the OEM style for the other four. I did notice my body lines don’t line up with the bed anymore like most of the videos but more of I’m trying to...
  5. J

    Help with Noise at Idle

    Wasn’t sure if this was the right place or not so feel free to move Admin if not. Here’s a video I took from the passenger side wheel well. This higher pitch sound is driving me nuts. I have no idea what or where it is coming from. It’s only at idle and you can here it go away with throttle...
    • Jake707
    • Thread
    • Replies: 19
    • Forum: LLY
  6. J

    Lift Pump and Sump Install Issues

    Ok I installed my new FASS 150 lift pump in the LLY and put in a sinister diesel sump kit at the same time. I followed the directions on both as well as a couple videos I watched. Everything went together nice and I let it sit over night with a full tank to ensure no leaks. Started it up and...
  7. J

    Limped the Trans on the LLY

    Well it happened. I have been running the level 4 performance tune on the CTS2 on my 05 lly and was running a dump trailer, not too heavy maybe 3k lbs or so and getting on the freeway it slipped and went to 4th gear only limp mode. I erased the code and put it on 3 the towing tune instead...
  8. J

    New Duramax Owner

    Just recently bought my first diesel, 2005 Chevy long bed 2500 LLy. Truck has about 140k miles on it and was stock when I got it. Over the past couple weeks I’ve put on 4” straight pipe exhaust, 3” MBRP down pipe, S&B knockoff turbo inlet mouthpiece, egr blocker plate with fingers stick, pcv...
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