The options for the '09 SRT8 are as follows:

CODE :: Option Description

21X :: 6-Speed Manual Tremec w/Trak Pak
22X :: 5-Speed Auto W5A580

AY2 :: SRT Option Group II
GWA :: Power Sunroof
MM8 :: Hood Stripe Delete
RER :: MyGIG Multimedia System w/Navigation
TTX :: 245/45ZR20 255/45ZR20 Perf Tires

The '09 SRT8 (Auto and Manual) and the '09 R/T (Manual ONLY) will come with a Getrag limited slip differential (true limited slip vs. the '08 SRT's brake-lock differential)