I'm not going to lie or try to defend what I did out of pride. I was in a hurry. I briefly inspected the parts. I mostly paid attention the the spindle side. I remember noticing that the snap ring groove on the old shaft was not as deep as the groove on the new shaft. In hindsight I now realize that because I did not turn the diff side of the old shaft while comparing what I was looking at when I noticed the groove was shallower was actually a compressed snap ring with oil on it. If I had turned the shaft and looked closer I would have seen the cut ends of the snap ring.
If I was a professional who looked at these every other day I would have most certainly noticed this. I am not, I am a backyard mechanic and this is the second time I have replaced a cv axle. I buy parts from autozone, they are a parts house who advertise as themselves towards catering to backyard mechanics. If they sell a defective part to a backyard mechanic I do not believe they can just say "well we do not stand behind these parts unless you are a credited shop." My business and loyalty is with autozone not the manufactuer. I paid for a complete part and was not given what I paid for. It is not realistic to think that they will never sell a defective part but when they do I do not think they should hold the customer responsible.
At the end of the day its not that big of a deal its a couple hundred dollars and about 10 hours of my time. I try to be an honest person and I believe that if I would have to lie to recieve compensation that I would rather foot the bill and leave that in the back of my mind as I buy parts for the rest of my roughly (Godwilling) 50 years on this earth building cars, trucks, boats, planes, anything else with a motor.
Disregard everything i say
I have a dana 30 front axle and amc 20 rear if anyone is looking. Both are 3.54, drums, narrowtrack.