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Message: <blockquote data-quote="99Sierra2500" data-source="post: 22683" data-attributes="member: 12343"><p>I have had everything from Action Lines up to GMT900's (a 2012 Sierra), I went and looked at a new truck, it was ok, a lot bigger than earlier models, a lot of electronics, and they also seem to have frame rust problems. GMT800's are sweet, I went back to them because I missed my old one. Distributors can be a pain, what I generally like to avoid are the pre-OBDII ones. I had a TBI squarebody, was ok, I think the only thing the ECM did was read the O2 sensors, pretty basic. People are sometimes amazed when I take a big screwdriver and put it on a bolt, touch it behind my ear to listen to inside an engine. I worked at a shop and we would hook up an oscilloscope to read the distributor.</p></blockquote><p></p>