Mine is doing it and has an aftermarket stall in it... so that tells me that there's something else involved.

 

Interesting,
Mine is way worse with a tune installed than stock, only tranny change in the tune in wot shift rpm.

Maybe it is oe tune related.

 

I can't remember where I read it but I recall reading a conversation around Chuck @ HHP was working with Chris @ Circle D because something was different with the 6speeds in the new trucks.

I'll see if I can find it, but no other info other than what I posted.

 

Here is a link to a GM document. Post #57 in the thread.
Describes exacting what mine is doing.

http://www.gm-trucks.com/forums/topi...8-speed/page-4

They are putting a new torque convertor in mine on Thursday.