1. Welcome To GMTruckClub.com!

    The #1 Chevy Truck Forum Online
    Online since 2004, we are the #1 Chevy Truck & SUV forum and user community. If you have any questions about your Chevy or GMC Truck, SUV or Crossover, or just want to connect with other GM owners and enthusiasts around the world, you've found the best place on the internet to do that.

    Join Today ~ It's Free
    Registering is Free and Easy! Hope to see you on the forums soon!

Knocking noise coming from the Allison T1000 on the down shifts.

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Jason2325, Jul 26, 2012.

  1. Jason2325

    Jason2325 Member

    Ok so its's a 02 2500hd 496ci and the trany is the Allison T1000 I think. It also has 180k miles. When I apply the breaks to slow down and the trany down shifts usely there is a knocking noise and it's happening a little more often also it knocks harder the hard I break. Is this normal? Do I need do anything?


Share This Page