Parts & Accessories Spare parts Caprice or Lumina 6-speed transmission for 2009 SS model. Caprice or Lumina 6-speed differential for 2012 model. The differential fits models from 2007/2016. And the transmission fits models from 2007 to 2013. There is also a 4-speed transmission and differential. 4-speed transmission for 2009 model. And a 4-speed differential that fits models from 2007/2016.