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I have a 1990 F150, the bearings that hold the pinion shaft against the ring gear let go in mine, got a $100 replacement rear end from a parts yard, installed in a day. Not sure how far Federal Way is from Burlington, but I do work cheap. Send message if interested. Jeff
Hey there Jeff, I'm right next to Federal Way and Burlington is almost an hour drive. I wanted to go out there to help but the drive is too much for me.
After having had mine go bad, I had to teach myself all the "ins and outs" of a Ford 8.8" diff. I ended up changing the entire rearend because the bolt that holds the cluster pinion shaft in had broken inside and could not be removed for disassembly. Got my replacement from an 88 f150, and took the attached antisway bar assembly with it. (my Canada built truck never had one, but all the mounting holes were there).
9 inch rear ends are easy to find. Search your local Craigslist. Always check your rear and front differential fluids at every oil change. Also don't forget the transfer case fluid too!