Genuine Mazda Differential Carrier Mounting Stud • 9YA9-01-208

Genuine Mazda 9YA9-01-208 Differential Carrier Mounting Stud

Replacement Genuine Mazda differential carrier mounting stud for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models.

The stud screws into the upper section of the differential housing and provides one of the threaded mounting points used to secure the differential carrier or mounting bracket to the differential assembly.

The carrier is positioned over the exposed threaded ends of the studs and retained using the corresponding mounting nuts. Together, these components form part of the structural mounting arrangement that supports the differential within the rear subframe.

Secure and correctly tightened differential hardware is important because the mounting assembly is subjected to changing loads during acceleration, deceleration and gear changes.

Four mounting studs are fitted per MX-5 NC differential assembly. This listing supplies one Genuine Mazda stud, so select the required quantity according to the repair being carried out.

Replacement should be considered where the original stud is heavily corroded, bent, stretched, cross-threaded, seized into the retaining nut or damaged during differential removal.

• Part type: Differential carrier mounting stud
• Mazda catalogue description: Stud
• Primary use: Secures the differential carrier or mounting bracket to the differential housing
• Location: Upper section of the rear differential casing
• Quantity fitted per MX-5 NC: 4
• Quantity supplied: 1 stud
• Retaining nut included: No
• Differential carrier included: No
• Brand: Genuine Mazda
• Part No.: 9YA9-01-208
• Also referenced as: 9YA901208
• MX-5 fitment: Mk3, Mk3.5 and Mk3.75 NC models
• Additional application: Mazda RX-8 differential assemblies

Fitment advice: This stud is intended for the upper differential carrier mounting arrangement. Confirm that the vehicle retains the original differential casing and carrier hardware, particularly where a replacement differential, limited-slip unit or modified mounting assembly has previously been installed.

Other items to consider: Inspect the remaining three studs, corresponding retaining nuts, differential carrier, mounting bushes and differential casing threads. Any stud with damaged, corroded or stretched threads should be replaced.

Useful tools / consumables: Suitable socket and spanner set, stud-removal tool or double-nut arrangement, penetrating fluid, calibrated torque wrench, thread-cleaning tools and a transmission or differential support jack.

Difficulty guide: DIY Difficulty: Advanced. The differential and carrier assembly must be supported securely before the mounting hardware is loosened. A seized or broken stud may require controlled heat, drilling or specialist extraction equipment.

Why Genuine Mazda? Genuine Mazda differential mounting hardware is manufactured to match the original casing thread, stud diameter, exposed length and strength specification. Correct dimensions help maintain compatibility with the differential carrier and associated retaining nuts.

What’s in the box: One Genuine Mazda differential carrier mounting stud, part number 9YA9-01-208.

Installation notes: Support the differential and carrier safely before removing any mounting hardware. Clean and inspect the threaded hole in the differential casing and remove old corrosion or thread-locking residue without damaging the threads. Install the replacement stud to the depth and tightening specification stated in the applicable Mazda workshop procedure. Refit the carrier and mounting nuts progressively and evenly, then confirm that the differential is correctly seated before returning the vehicle to service.