Transmission Failure problems of the 2005 Chevrolet Tahoe

My 2005 leased chevy Tahoe had approximately 49,000 miles on it when the transmission failed. There was no forewarning. The car performed normally right up to the minute the transmission let go. I was driving 45 mph when a gear exploded and the car was left with only first and third gear. The car was brought to a dealer and gm refused to cover the repair because we had not taken their extended warranty. I was furious because after inspecting the torn down transmission, it was obvious that there was no abuse to the vehicle and that the gear had shattered inside the housing (I have pictures of the inside of the transmission). I first called the gm service 1800 number and they refused to pay for anything. After a week of speaking to agents and supervisors, I was given the name of the local chevy dealer district manager. I contacted him and after investigating, he offered to pay half the cost (total cost estimated to be $3200). I let the car sit at the dealership for 21 days while I fought with these people. Finally, they agreed to pay for everything but the dealership labor. They also said they would guarantee the rebuilt transmission they were installing for another 100,000 miles - that was of no concern to me since it is a leased vehicle I will be getting rid of as soon as possible! I paid approximately $450 for the repairs and picked up my vehicle after 28 days. It seems to me that if you are willing to stick to your argument and have the ability to leave your vehicle sitting in the dealership repair shop, you can bargain because they know deep down it is a defective part and should last longer on a $38,000 vehicle. If I wasn't 8 months pregnant at the time, I would have let the vehicle sit there until they paid for everything. Ps - it was a boy!!.