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Hi Everyone, I'm hoping someone with a little more knowledge about transmissions and cars in general can help me. For the past few months I've had an issue with 2007 Ford Edge shuddering at around 1500-2500 RPM. I finally took it to my mechanic and he told me he thinks it is the torque converter. He said since it's not that bad and the end result is going to be a transmission rebuild I should leave it until it gets unbearable. I have done some "google" research and came across a few different things. First, should I try a transmission stop slip product? There a re a few and I went to Canadian Tire I picked up Lucas Stop Slip but before I try it I want to find out if there is a better product that I should use instead. Second, I've had this vehicle for 3 years, I drive a lot and it has high milliege 200,000KM + I've never changed the spark plugs. Should I get that done to see if possible a misfire in the engine could be causing my torque converter to act crazy and they probably should be done anyway? I used to do this myself on my older cars but on the Edge it is a lot more difficult then simply changing the plugs and I'm not gonna start taking a part the manifold, I'd rather just pay someone else to do it. Please help, any other possible suggestions would be greatly appreciated. I'd like to prolong the life of my transmission as much as possible. Thanks in advance for any help that may be giving!