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Message: <blockquote data-quote="Big King Crab" data-source="post: 26819" data-attributes="member: 3643">I have a 2005 Chevy K3500, LLY Duramax/Allison 1000 combo with 200k miles that has been making a loud single clunk when you first shift into drive or reverse from park and will do it again from reverse to drive or vice-versa. There's also an occasional light thunk with loud clicking sound inside the transmission pan that last about a second or two.Warm or cold it's always the same, when driving it doesn't shift past 3rd gear.There are no codes being displayed and the shift indicator doesn't light up either.I have replaced the NSBU and cleaned the connector, replaced both internal and external filters, dropped the pan and inspected/cleaned the solenoid connectors and entire area visible around the valve body, I made sure all the solenoids were properly seated as well. U-joints are fine, drive shaft carrier bearings are good, all fluid levels are full.I'm out of ideas of what it could be...</blockquote>