Hello, I have a 1992 F250 460 with a e4od. In lower RPMs I am having a torque converter shutter issue. At least I think it's the torque converter that is making the shutter. In low rpm's the truck jerks, like the torque converter is locking in and out. I just replaced the whole transmission and it has a brand-new torque converter in it. My overdrive button doesn't work so I unplugged it ( just to see if this made a difference) and it did nothing. I am new to these transmissions and I am stumped on what to do to fix this problem. Someone please help me! Thank you so much