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  1. #1

    Default SLP underdrive pulley

    Has anyone installed the SLP underdrive or and underdrive pulley on a newer 5.3? And if so is worth the $220? Can you tell the horsepower increase but the ol butt dyno?
    2010 silverado LT 5.3l z714x4 blue granite metallic
    Diablo Trinity-Airaid Intake-Flowmaster Delta 40 1into2 out back

  2. #2


    An under-drive set of pulleys is used when you want to save a little of the hp being used to turn the accessories.

    When used, the pulleys turning the alt, power steering, etc turn slower that stock for any given engine speed.

    This saved hp can be used to move the vehicle.

    Would it show on a dyno? Yes.

    Can it be felt? I doubt it.

    However, what you may feel, is a power steering pump that does not feel like it's working correctly and an alternator that may not keep the battery charged.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3


    Not worth it for the price. Save your money and put it towards a cat-back exhaust and a custom tune for your diablo.
    2003 Silverado 2500HD 6.0L Vortec V8
    2" Body Lift
    3" Suspension Lift
    Skyjacker Hydro 7000 Shocks
    Skyjacker Steering Stabilizer
    35" Tires with 20" American Racing Rims
    Velocity Cold Air Intake
    Billet Throttle Body Spacer
    BBK Performance Headers
    MBRP Cat-Back Exhaust System
    DiabloSport Predator- Soon to be tuned by Diablew

    "Soon to be leveling-kit"

  4. #4
    Sr. Mechanic
    Join Date
    Jun 2011
    Tuscaloosa, AL


    I would definitely have to agree with metaluzc save the money and put it towards those and you will feel a good bit of difference.
    2004 GMC Sierra SLT 6.0L 4x4
    UWS Low Profile toolbox 10% tint front and over stock back tint
    AirAid MIT and K&N airfilter
    BlackBear Performance

  5. #5


    You might have charging issues by using an underdrive pulley, your 2010 truck has an integrated system working the alternator to reduce alternator drag on the engine, I'm not sure how the two would work together.

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