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I was looking at 8.8s and they both had this code on the back what does it mean I cant seem to find it any were on here or the net..

e9sw4033-ja stamped on the back cover whats it mean?
 

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I don't think that will tell you anything about the gears. Is there a tag attached to one of the cover bolts? It will tell you what gears and if it is Trac-Lok. Look for something like "3 27 88" (3.27 8.8" open) or "3L27 88" (3.27 8.8" Trac-Lok).
 

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You can also look up the axle code on the sticker in the door jamb. There is a chart for all the different codes in the technical articles.
 
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