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To bring this up to date,,,,,, couple weeks ago, I took my 2500HD to local shop. Of course he scanned codes, found the P0894 code. His suggestion was to try a torque converter solenoid with around 60-70% chance this would work. So,,,, that's what he tried. Unfortunately,,,, I fell into the...

Thanks gentleman for your input! As I stated last, I removed the programmer and returned back to "stock" tune. Drove truck this morning and as usual, shifts just as it should when cold. By time I get to town (11 miles) of course truck is up to operating temperature and all through town, at stop...

Thanks for your response Warwagon! I took the program out and returned to "stock tune" Ill find out in the morning what happens. My ignorance tells me, the tuner may not be the problem. I've ran the tuner 3500-4000 miles (quite possibly more) before I started having the issue. Now,,, this...

Sorry if I'm duplicating another thread,,, but I'm not seeing an issue similar to mine. I have 2006 SILVERADO 6.0 gas, 4L80, 207,000 miles, 2nd owner. The truck shifts exactly as it should when start up cold. However,,, once truck gets up to operating temperature, it shifts "BANG" extremely...

Do what you always did and get what you always got!