I have a 2009 Chevy Tahoe Hybrid and have recently had (what seemed to be) transmission issues that included issues like missing while driving, slow changing gears including high RPM's, along with hard down-shifting when coming to a stop. I took it to a Chevrolet dealership who told me that I needed a new transmission costing $5,500. I have already put $3,000 in it over the last 6 months including Throttle Position Sensor, the Throttle Body Module, Wheel Bearings, etc. so hearing another $5,500 was definitely a shock. I found a local guy that works on transmissions so I took it to him for a 2nd opinion. He found that there were no transmission issues, it wasn't throwing any codes and that the problem lied with the motor mount. When the accelerator was being pushed, the engine was jumping around with no stability. When coming to a complete stop, as the car would slow down, the engine itself was dropping causing the hard down-shift of the transmission. Fortunately, he saved me the $5,500 but it did cost me $850. I'm praying this fully fixed the issue because spending over $4,000 in less than 6 months is crazy. I love my Tahoe, especially with the Hybrid functionality so any feedback would be greatly appreciated. Thanks! Tiffany B.