Why is my transmission shifting hard? What can i do to fix this? I have a 2005 Pontiac Grand Prix.
I have a 2005 Pontiac Grand Prix with an automatic transmission with 100,000 miles. This will be confusing, but my transmission shifts hard when it wants to. It does not do it every time, but it does it from time to time and when it does this it shifts hard and jerks my car and makes me get bad gas mileage. I have noticed that is does it most often when i have to slam on breaks or speed up really fast. Please help me, what causes this and how can I fix this. I also have warranty, but they will not fix until it is broken. Please help me.