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 Rockstar

    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?


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