I have been having some troubles out my automatic here lately. It does not want to upshift unless you let off the gas then you have to be nice to it to keep it in that gear and it has also been shifting like it is a five speed. In between the 3-4 shift its settling in halfway like its got a extra gear. Also it wants to downshift anytime I give it the slightest hint of gas. Could I be having torque converter lock up failures causing this. I am more versed in the big American trans more so the 4R100, 3L80, 4L80E, Turbo 350 and Turbo 400. I know if you are having converter lock up problems with those it will mess with the rpm's until it finaly locks or unlocks could this be my problem. Any Ideas