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Ed,
I had a clicking noise that was only heard while putting a load on engine a few months back. This was with new CV's but "who knows how old" wheel bearings. What I found to be the cause was loose bolts securing CV axle on left outboard axle. With the car jacked up and in neutral, I could turn the rear tire and see the axle was not turning true. Put a wrench on the outboard bolts and found them really loose. Tightening solved my problem.
You could still have problems in either area you described (cv joints or wheel bearings). Before busting out that credit card, I'd do some disassembly and see what you've got. My failed cv's had obvious damage upon removal from car as bits of metal rained the shop floor when removed. Funny.......they made no weird noises prior to removal. I only pulled them to do a engine replacement.
Not sure if you can spin the rear hubs with bearings installed (cv alxes removed) and determine failure or not. I'm in the middle of upgrading to 5 lug conversion and have taken pics of just about every piece of project..........let me know if you want to see any particular part for clarity.
John
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'73 914
(Renegade V8 conversion)
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