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  1. DuramaximusPrime

    Here for the wisdom of the Diesel Elders.

    Ok, this took me down a rabbit hole. I found some stock 05 LLY dyno's and it appears your right on the money. The 05 LLY is 310 HP at the crank and about 13-14% less at wheel (266HP). So perhaps this is why I keep seeing varying numbers as to what the Allison can handle. So 330 HP at the wheel...
  2. DuramaximusPrime

    LLY: Questions I have been unable to answer.

    A simple solution that may end up being my answer. Currently have a mouthpeice waiting for install and been looking into a air box mod. The EGR will happen soon. Exhaust is big money so I may just leave it stock for now or delete the cat and keep it stock. I figured the downpipe was probably...
  3. DuramaximusPrime

    LLY: Questions I have been unable to answer.

    The truck is 4x4. The truck is currently a "daily driver" even though it's not driven daily. I don't want to limit its towing abilities although I have no plans of big towing in the future. In the past, she towed a large 5th wheel like it wasn't even there. She doesn't go offroad accept very...
  4. DuramaximusPrime

    LLY: Questions I have been unable to answer.

    Reading the BPU upgrade list for the LLY was helpful. "Transmission upgrade - As soon as you pass 400rwhp you are living on borrowed time. You will need a minimum of a converter, C3's, and valving kit." Sounds like 400 RWHP is my new maximum goal.
  5. DuramaximusPrime

    LLY: Questions I have been unable to answer.

    Appreciate your input!
  6. DuramaximusPrime

    LLY: Questions I have been unable to answer.

    Awesome reply, thank you for your insights!
  7. DuramaximusPrime

    LLY: Questions I have been unable to answer.

    Howdy Duramax residents! After a ton of research, I have come to realize the missing information required to plan my build requires experience to answer so I came here to find some wisdom. I'm looking to extend the life of a 05 LLY and hit 400- ̶4̶5̶0̶H̶P̶ RWHP. I know a tuner can give the HP...
  8. DuramaximusPrime

    Here for the wisdom of the Diesel Elders.

    Howdy folks! I am here to learn about 05 lly's so I can help my father upgrade his ride. He's a pretty kickass father so I've been planning this for a while. The main goal is to extend the life of the truck. The secondary goal is 400-450HP. According to what I've read this is safe for the stock...
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