When I did my Turbo-Coupe brake swap, I found that the gears and the 8.8 were in excellent shape. This seems to be the case with the majority of T-C rears since they just weren't that torquey. I sold the gears and will sell the 8.8 as soon as I double-check the clutch thicknesses (more for the info of the buyer than as a concern for wear!).
If you don't mind my $.02, I would keep the T-C axles and add them to you Mustang. The rear track will be 1.5" wider, but that is good since the Mustang rear is an inch NARROWER than the front from the factory. So in the end, the rear will only be .5" wider than the front. FWIW, my 16" Pony's fit just fine. Yes, you'll need different e-brake cables from Ford Motorsport. I happended to use the '93 and later cable since I also got the mounting bracket that fits up under the floor right behind the e-brake - these are much better cables! Good luck.
2003 Silver Metallic Cobra:
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Custom Ford thermostats: