WTB 3.73 or 4.10 differential

You looking for just the ring and pinion?

https://www.summitracing.com/parts/fms-m420988373a/make/ford
https://www.summitracing.com/parts/fms-m4209-88410f/make/ford

Or a limited slip differential along with the ring and pinion as well as all the installation kit?

The Ford 8.8 Trac-Lok differential is a proven choice but there are others depending upon your application. I've found the easiest route was to get a used center section and assemble the replacement unit out of the car for a relatively easier swap overall.
 
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