im working on a 2005 Silverado, with a GEN4 engine, 6L80E trans, i want to keep everything working as factory, i been reading a lot and the best rout so far is to run a E67 ECM as it is compatible with the A6 trans, it has the correct inputs signal on the cruise control,(AT LEAST ON THE TRAILBLAZER), and has serial data , this way cruise control, cluster and A/C should work,,

what i need is to know what was the last trailblazer SS year using the E67 with serial data and the correct cruis control signals to work with the silverado cruise controls...

hope someone can help me with this