ZF numbers 12577015 Parts List Number 1319050059
Very hard to find and most places will not even sell you one without a core return or a huge core charge of $2000.00 See Zumbrota bearing and gear, they will charge you $4290+2000 core for one of their rebuilt units. http://zbag.com/ts6-650c-10.html
First come first serve sold as is for cash only no shipping. $1600 firm price.
I have not tested this on any vehicle. It does spin very smoothly on the input and output shafts with no play. The shifter moves into all gears smoothly. It has some paint marks from a junk yard on it so i assume it is a good working pull and not a core return. I got it in a freight auction with plans to install it into my GMC 2500 but i won't have enough time to make it happen.