Regarding the awful clunking noise you can hear if it is coming from the rear it is probably the mountings for the rear suspension. If my memory is still working ( it has been about 37 years since i worked on them ) there are two bonded rubber mounts on each side. One works in compression and one works in shear and it is the latter where the bonding fails and allows metal to metal contact and noise. Simple and quick job. From memory take the back seat base out and undo the nuts, jack up the body and the mounting will drop down giving you access. Recommend changing them all at the same time.
Think there is also a grease nipple for the torque tube centre bearing. Worth giving that a squirt.
Think there is also a grease nipple for the torque tube centre bearing. Worth giving that a squirt.