Bad Knocking Sound Coming From Driveline.

[r31et]

hey all I have a bit of a serious knocking sound coming from the drivline of my cefiro. it started after dropping 2nd gear and then missing third and droping it in hard when i found it, at first i thought i was the gearbox as it had been making a bit more noise than usual, so i swapped the gearbox for a known good one and when i took it for a drive the noise was still there. Im fairly sure it isnt the motor because it can be revved as hard as you like and makes no unusual sounds if i have the clutch in or have it in neutral. so im thinking is could be the tailshaft or the diff although it sounds like its coming from the middle of the car. I also didnt take the clutch apart when I had the box out. I wont make the sound the clutch is in so it is probably on happens when there is load on it.

any help appreciated cheers Ryan

[some_cs_student]

Does the sound occur only on gear changes?

And when getting off (no noise) and then accelerating with a clunk sound coming from towards the back of the car?

[r31et]

nah it will stop while changing gears and it happens regardless of acceleration, backing off or cruising constant..