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[updated:LAST EDITED ON 30-May-02 AT 05:41 PM (EST)]Most half ton trucks after 81 came with the 8.8 inch rear axle.
to see for sure look on the same line of the tag where it says 308 and it will say 8 8
This is a good rear end though not the best under high loads but good for daily usage.
If its an 8.8, then all the aftermarket internals made for the 5.0 mustangs will bolt right in. I would suggest ditching those sleepy 3.08's and getting something more along the lines of 3.75's or 4.11's.