The S80 T6 received the GM transmission (it handles more torque). The
normally aspirated engine (the 2.9) used an asian warner transmission
(same supplier as in the 850 and 70 series).
But, from the description:
Poor transmission shift: On less than 10,000 vehicles, the transmission was receiving an announced software upgrade (2000-01) and those with a GM (model 4T65) transmission needed a replacement shift solenoid to correct a shudder between 2nd and 3rd gear. (1999-2000)
it is not clear if the software upgrade applied to more then one transmission
type and the solenoids were just for the GM's.
You can get a subscription to www.alldatadiy.com for $25/year that includes
service information including the full text of all technical service bulletins.
These bulletins often specify the repairs down to the vehicle serial number.
I've found this information it worth the $25 (second year is actually $15).
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