First off, no, the stock 7.5 from your '92 will not have a trak-lok in it.
Second, although you don't actually say it I'm assuming you're converting the rear to 5 lug. If you're gonna do that, why bother trying to find a Turbo Coupe rear axle? Might as well just find a Mustang rear axle to convert since if you take Ranger axles you'll end up with drums anyway.