Other Fuel System Tank Mounting problems of the 2007 Chevrolet Uplander

The fuel gauge/fuel range has been malfunctioning since 09 in that the gauge could change or fluxuate as much as 1/8 to 1/4 tank in a very short time. The fuel range which I thought showed how many miles you should be able to drive considering the amount of fuel in the tank, that changed as much as 50 miles and a few times, the fuel gauge would read about 1/8 of a tank, and I have driven 1 block, and it showed empty. Realizing that other are other factors, I do however feel that it is a safety issue especially if I'm on the highway. This same problem still exist as of the writing of this complaint and 2 different dealers have supposedly fixed the problem by changing the fuel sensor (4 times) and refused to change it the last time that I took it to them. The second issue (and I put power train) but it has to do with my transmission but I did not see that in the options. In September of 2012, I complained about transmission problem and the dealer could not duplicate the problem. I took it back to the dealer in November of the same year with the same problem and they did notice the problem and they supposedly fixed the problem, however because my extended warrantee had expired in October a month prior, they said that it would be fixed but I was charged $300. 00 which at that time, I had no other choice but to pay it so I did. Last November 2013 thanksgiving weekend, my transmission failed and my family was stranded 400 miles away from home and had to leave our vehicle and rent a car to get home and then go back and pick up the van. After getting it back home, the dealer did make a repair to the transmission again, but as they have acknowledged, it is still a problem with the shifting and that they would be willing to pay up to 1500 of the repair. Another dealer told me that I needed a new transmission. Currently, I have 82k miles and need third transmit repair.