so i just got this 1995 f150 runs great and shifts great up until 4th gear. In 4h it has a very noticeable shudder while driving up a hill or shifting into OD. What could be causing this? is my transmission going out? torque converter? or possibly an engine misfire? I've read a lot but no good answers yet

 

Does the shudder just happen during the 3-4 shift or does it continue shuddering?

 

it actually shifts good from 3-4 but the shudder occurs in the gear while driving...especially up hills or when motor is bogged down