* Year Specifics: While the basic design is compatible, there might be minor differences in mounting points or bracketry depending on the exact year of the LX platform Mustang. A 1992 GT axle is from a Fox-body itself, making it very likely to be a direct swap. However, double-checking specifics is always recommended.
* Brake Differences: The brake setup might be different. You might need to swap over brake components to match the rear axle you install.
* Suspension Differences: There could be slight differences in the suspension components that mount to the axle, again requiring some adaptation or parts swapping.
4-Lug to 5-Lug Change:
Ford Mustangs switched from 4-lug to 5-lug wheels in 1994 (for the SN95 platform). Therefore, your 1992 GT Mustang would have a 4-lug pattern. If your LX Mustang is also from before 1994, then the lug pattern will match. If your LX is a 1994 or later, then it's a 5-lug and the axle will not be a direct bolt-on.