rear of car drivers side @ 1mph a clonk that gets qiucker with speed until 30ish then cant hear it (PROBABLY DUE TO EXHAUST)

dont do it when rolling 20 to 0mph with the clutch down?

now ive got it jacked up no wheel bearing play,

the drive shafts should move in and out long ways slightly? am i right?

but not up and down atall? if so there seems to be some up and down play in the side the noise is?

does this seem right, am i correct in whats said?

cheers