If you are an AAA Auto Club Member you can get a discount from NAPA. Not sure on other Auto Clubs or something like a Veterans discount but ask.

The City School District I worked and a business I worked for and a lot of repair shops use NAPA Parts.
I don't know if that ends up meaning their Aftermarket Axles are better then say AutoZone’s. Also don't know if they have lifetime warranties.

Altrom is likely a made up name like AutoZone’s Duralast name or the Sears JC Higgins. So NAPA likely picked an already made brand and put their name on it.

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84 300D, 82 Volvo 244Gl Diesel