1982 239te knocking noise

[230te man]

Hi all,
My 1982 230te has developed a knocking sound on overrun and when slowing down. I am concerned that this could be an expensive repair, has anyone any idea what I need to check to locate the source of the noise.
230 te man

 

[television]

Hi all,
My 1982 230te has developed a knocking sound on overrun and when slowing down. I am concerned that this could be an expensive repair, has anyone any idea what I need to check to locate the source of the noise.
230 te man

May not be too bad,is the sound from under the car,if so could be propshaft UJ's

Malcolm