Allison problem

[DAN BIGBLOCK572]

I have 2005 duramax 5 speed allison my problem is when it shift into fourth gear and overdrive it chadders when normal driving if I speed up it shifts fine what do you think the problem is thanks

 

[pushlar84]

sounds like torque converter clutch is slipping

 

[DAN BIGBLOCK572]

Thanks for the help so does that mean the torque converter is bad

 

[Durydeek_88]

is it a chatter or a quiver if its a loud bangin chadder you could have cracked flex plate if its a soft chadder or a quiver id agree with Pushlar84