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Message: <blockquote data-quote="JorgeS" data-source="post: 26843" data-attributes="member: 12094">My 2005 Yukon has ~145,000 miles.Very little towing; I bought it with 103,000 and it had never had a trailer hitch installed. Transmission fluid was clearly changed before I bought it, and it is still a bright pink color. I installed a Curt hitch and have done some light towing with it, but nothing big.Here's the issue: Every once in a while, after coming to a stop, it will start in 2nd gear, then quickly shift to 1st. This happens VERY quickly, as in less than one second after you press the accelerator, it will start to move, then shift down; you can feel the jump in torque when this happens, then everything is OK...until the next time it does it.It happens very irregularly, maybe every few weeks, there may be a couple of months between incidents. I have not noticed any pattern leading up to this.Anyone else experienced the same thing?I do plan on putting in a Corvette servo and replacing the TC clutch solenoid with a solid spool to maintain TC lock-up while driving.Thanks!</blockquote>