Clunk in my drivetrain?
IS it a one piece driveshaft? When you pulled the driveshaft out to change the U joint did you grease the splines in the yoke?
the yoke slips in the back of the transmission tailshaft.
Sometimes if the splines are dry the yoke sticks in the transmission and can cause a clunk. Make sure your rear trans mount is not broken.
Clunk in my drivetrain?
Mayb the kickdown or a sensor!
it's your transmission dude
