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Why does Subaru show different axle part numbers for the rear?

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Not sure why, but I noticed the same looking in the FSM. As far as I can tell they were different starting in 90 all the way up to at least 04, probably beyond.

hmmm...could the LSD rear diff in the 'weather' package be the difference? no one has ever mentioned an external difference in anything I've read - just internal. It says 3.0 liter, maybe it isn't length - but axle dimaeter for more strength?

Edited by 1 Lucky Texan

The 3.9 diff in the legacy SS has different axles on both sides for the LSD drive or something...

 

I think the side difference is because of the part that goes through the seal, it has some spirals cut into the surface I think for keeping oil from getting out.

You can see what I mean in the uppen axle in this pic:

http://i.imgur.com/mqb0ysx.jpg

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