New Member: 2006 Gs430 Differential And Suspension Questions

[Dans GS430]

I am a new member to Lexus Owners Club. Just bought a 2006 GS430 with 47k on the odometer. As with all cars I have owned, I am educating myself as to all technical attributes of my car. There are just a few questions I have not been able find answers.

1. Is the differential a limited slip type? If yes, is it a Torsen type or clutch-pack? Is it electronically controlled?

2. Are the adjustable shock absorbers adjusted automatically according to conditions or merely set by the driver (tour / sport)

3. Is the power steering electronic or hydraulic?

Thanks for any information.