i have a 1997 f-150 4x4 with an auto. trans. it had 120,000 miles on it when i bought it and at about 135,000 miles the trans. would shutter when shifting.i had a new torque conv. put in and now it has 155,000 miles.it is doing it again,but not as bad.actually,you have to know what you are looking for to even feel it.what is the problem?