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Message: <blockquote data-quote="stutaeng" data-source="post: 23969" data-attributes="member: 6175">Summary:1. The Chellos worked on the 4Lxx-series transmissions (specifically the 4L80e) as powertrain engineers, both him and his Dad. GM have engineers do annual updates to the their assigned units, which can vary from actual fixes to common issues, but mostly measures to reduce production costs. He left sometime in the mid or late 2000s, but still does some consulting work for manufacturers and mostly does work for the performance market.2. Chello mentioned the common myth that the 5 planetary gearset of the 4L65e is superior to the original 4 planetary gearset of the 4L60e. What actually happened was GM changed the metallurgy of the newer gearset (was cost-cutting, of course) and marketed the later and a superior design.3. Bean counter executives have meetings with the engineers and basically demand designs (new design or solutions to existing issues) be the cheapest solution.4. Mentioned how GM took the 6Lxx from ZF and basically value engineered it (changed internal things to tin cans), including the valve body and the pump, which turned out to be the problem areas. Ford OTOH, basically left the units unchanged and they had less issues. ZF engineers were like, "why are you guys trying to change or modify things?" when they had meeting with GM engineers in the late 90s/early 2000s.5. Mentioned how the electronics have been getting so complicated. And most all other manufacturers have adopted these complex systems and they too are having issues.6. When asked what truck would Chello buy, he basically said a GM from the early 2000s! [ATTACH=full]3294[/ATTACH]7. Chello says the last great year of the GM trucks was the 2006. Basically, the GMT800! [ATTACH=full]3295[/ATTACH]I'll continue watching later, and maybe add stuff that I missed. I may try AI to summary TBH, LOL.</blockquote>