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There is an odd issue with some aftermarket cv axles that cause a vibration when stopped. I can't remember but if I recall, if you put it in neutral the vibration stops... Sorry i can't be 100% sure of the symptoms but there are discussions hereabouts.

not all, but many, cars are made this way - others can give more details I'm sure; http://www.pirate4x4.com/tech/billavista/Wiring/Part2/images/Alternator-block_diagram-2.jpg

that’s a lot of issues. Sounds like something is off or you had bad axle luck which isn’t that unlikely as you’ll see check that your front strut top spacers are properly clocked. They install rotated one way only. check engine and trans mounts for slop add an extra 1/2” spacers. call Scott and ask. I’ve always found Scott reasonable to talk to. 1. CVs are trash. I hear you said you tried OEM but I have my doubts on how rigorous that assessment is and maybe they were driven horrendously without boots at some point in their life or compromised or 250,000 miles like many used Subaru parts now from the 80s. look up all the people blowing axles on here and discussing which aftermarket trash or new brand garbage is going to be the next magic unicorn for Subarus. It’s not going to happen. Including the epic thread of me telling folks the HD trac motive or whatever garbage had zero chance of being worth the trial. Yep ended up an epic waste of time. Wash rinse repeat. Avoid aftermarket like the plague. No matter what anecdotal report you hear or add you read They suck for Subarus. I won’t even install them on *non-lifted* Subarus They’re that bad. It’s not going to happen. You need to go buy 5 OEM axles. Then regrease them with quality proper amount of grease and new boots. maybe you’ll loose one or two due to high miles or previous grit exposure. But you’ll end up with 3 or so that perform well enough you’re playing more than working. ive busted boots with my 2”+ lift with no spacers at 10,000 ft in colorado and drove 2,000 miles home. They were OEM axles with new joints that vibrated like crazy the whole way home my rear view mirror was barely usable it was shaking so bad. what’s better - I cleaned and greasers and rebooted them and still run them and one is on another members car on this forum right now and has been for 8 years after that epic trashing. Marshall I’m colored axles FTW. reread everything I just wrote. Aftermarket is trash. maybe at 30+ years old they’re impossible to find but it’s worth trying.