I don't know jack about a 10.25" rear end but hopefully this link will help. Go over to
www.f150online.com/ to their web board and post in there. Surely you could find someone over there to help you out. You might also try
www.pirate4x4.com/ and post in the Ford section of the web board. Those guys know alot especially for 4x4's. I'd say they could for sure tell you what you need to do.
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1994 Red SVT Lightning #2019