1968 Impala snapping in rear end I think? - Impala Tech
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post #1 of 3 (permalink) Old 09-23-2013, 04:11 PM Thread Starter
 
 
Join Date: Sep 2011
Location: Grand Rapids MI
Posts: 9
 
1968 Impala snapping in rear end I think?

I have a 68 Impala convertible 327 auto. I had the front converted to disc brakes(Ecklers kit) and at the same time had the rear brakes redone for peace of mind. When they were redoing the rears they said the bearings were suspect so "while you're in there" they replaced the rear bearings. They also said the bearing surfaces on the axles were not real nice so they used a different style of bearing. They said it is common to do that but they had not done it on a posi rear end before. Now when I turn at slow speed I get a snapping sound. I have 2 C3 Corvettes so I know what a posi clutch snap sounds like and the Impala has posi. The sound is similar BUT it sounds like it's coming from outside of the diff. Almost like the brakes are hanging up and then snapping free. The car even shakes. The shop checked the rear twice and found no metal bits. They used posi additive both times. No change. I'm baffled! Any thoughts? Could it be the FRONT calipers hanging up?
Thanks
Mike
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post #2 of 3 (permalink) Old 09-23-2013, 05:25 PM
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I am not in favor of the axle saver bearing because it doesn't in fact save the axle. They move the bearing inboard but the axle isn't hardened at that location so it will wear through even faster since it isn't as hard and you have twice the weight on a smaller area. If the axle is worn out it needs to be replaced and new bearings and seals used.

That being said I still suspect the posi as sticking. Modern axle fluids are not as good as the older stuff (which used to be made of whale oil), but as you might expect in todays tree hugging environment killing whales for the light oil in their blubber is out of the question.

I recommend Texaco 9622; Mineral based 80W90; which is the same as GM Part # 9985290. Do not use synthetic gear oil with their slippery silicon based additives.

Big Dave
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post #3 of 3 (permalink) Old 09-24-2013, 03:13 PM Thread Starter
 
 
Join Date: Sep 2011
Location: Grand Rapids MI
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Thanks Big Dave. I'll give that a try.
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