http://gm.wieck.com/forms/gm/previewpage?036563
The ZZ572/620 from GM Performance Parts is now covered by a 24-month/50,000 mile warranty when installed in a street applicable vehicle.
http://gm.wieck.com/forms/gm/previewpage?036564
The GMPP 4L65-E Transmission is covered by a 12-month/12,000 mile warranty when installed in a street legal vehicle.