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Thread: 2005 LLY / AL5 Limp undet wot

  1. #1
    Senior Member
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    Default 2005 LLY / AL5 Limp undet wot

    Hello,

    I have tuned lots of 4l60/80's never really played with the AL5.

    I put a 100hp tune in a 2005 LLY against my advise into a customers service truck, a very heavy k3500.

    When he goes wot, the transmission goes into limp mode, Is there anything besides building a transmission that can be done?

    Thanks

  2. #2
    Lifetime Member Cougar281's Avatar
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    Put it back to stock..... Even then, since it's been limped, depending on how many times it's limped, putting it back to stock might not stop the limps. 100hp over is 'Walking the line' even with a fresh stock LLY/AL5. Some hold it, some don't. Anything with mileage is a huge roll of the dice.

    Sent from my 2PZC5 using Tapatalk
    Last edited by Cougar281; July 8th, 2020 at 10:09 AM.

  3. #3
    Lifetime Member killerbee's Avatar
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    Quote Originally Posted by derkscustomcars View Post
    Hello,
    Is there anything besides building a transmission that can be done?

    Thanks
    In this truck, limp is almost always in 5th gear. Torque is what creates it. If you drop the tune 10-20 HP, and build an AL5 tune that prevents 5th gear below 2400 rpm (downshifts to 4th at higher speeds and lower throttle position), you can eliminate the limp. Or just advise the customer to get smarter with his right foot in 5th gear.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
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