Join Date: Aug 2005
Location: Camlachie Ontario Canada
The answer in my 87 Quad was the rear wheel bearings.
I bought premium SKF replacement bearings from the local bearing supplier at about 1/2 the cost of what the major alfa parts outfits charge. Both bearings were shot.
You will need seals and bearing retainers. Retainers are not always available, let me know if you need 2.