Ring & Pinion Gear Set - 1987 Mustang

When upgrading or replacing the ring and pinion gear set on your 1987 Ford Mustang with the 5.0L V8 engine, consider the OEM part numbers E7ZZ-4209-A and E7ZZ-4209-B for 3.55 and 3.73 ratios, respectively. These gear sets are compatible with 1986-1993 Mustangs, making them readily available in junkyards. When inspecting a used gear set, look for signs of wear, such as pitting or scoring on the teeth, which can affect performance. Ensure proper installation by using a gear setup tool to achieve the correct backlash and pinion depth. Common failures include excessive noise due to improper setup or worn bearings. Remember to verify compatibility with your specific rear end configuration, as some models may require different carriers or mounting brackets.