Genuine Mazda 5th Gear / Reverse Selector Fork – 6-Speed • P601-17-406

Genuine Mazda P601-17-406 5th Gear / Reverse Selector Fork

Replacement Genuine Mazda fifth-gear and reverse selector fork for Mazda MX-5 Mk3, Mk3.5 and Mk3.75 NC models equipped with the six-speed manual gearbox, together with confirmed Mazda RX-8 six-speed manual applications listed in the compatibility table.

The selector fork is an internal manual-transmission component that moves the relevant synchroniser or selector sleeve when fifth gear or reverse is selected. It transfers movement from the gearbox change-control mechanism to the internal gear-selection assembly.

The fork is located inside the six-speed manual gearbox on the associated selector rail. There is typically one fifth-gear and reverse selector fork fitted per gearbox. This listing is for one Genuine Mazda selector fork.

Wear, bending or damage can cause difficult fifth-gear or reverse selection, incomplete engagement, excessive selector movement, abnormal transmission noise or the gearbox jumping out of gear. The underlying cause of the gearbox fault should be identified before replacement internal components are installed.

• Part type: Fifth-gear and reverse selector fork
• Primary use: Moves the selector or synchroniser assembly during fifth-gear and reverse selection
• Location: Inside the six-speed manual transmission
• Position: Fifth-gear / reverse selector rail and change-control assembly
• Quantity per vehicle: 1
• Quantity supplied: 1 selector fork
• Brand: Genuine Mazda
• Part No.: P601-17-406
• Also referenced as: P60117406
• Fitment note: For confirmed six-speed manual-transmission applications only; not suitable for five-speed manual or automatic gearboxes

Fitment advice: This is an internal gearbox component for the confirmed Mazda six-speed manual applications. Mazda officially describes it as the fifth-gear and reverse selector fork. For imported, modified or previously rebuilt cars, matching the gearbox identification, original fork design and part number is recommended.

Other items to consider: When changing this part, you may also want to consider purchasing the associated synchroniser hub and sleeve, baulk rings, selector-rail components, detent parts, gearbox bearings, oil seals, casing sealant and fresh manual-transmission oil.

Useful tools / consumables: Transmission jack, workshop press, bearing pullers, circlip pliers, torque wrench, dial indicator, feeler gauges, assembly lubricant, suitable gearbox sealant and manufacturer-specified manual-transmission oil.

Difficulty guide: DIY Difficulty: Advanced. Replacement requires removal and substantial disassembly of the manual gearbox. Internal parts must be inspected, measured and reassembled in the correct order using the specified clearances and torque settings. Installation by an experienced transmission specialist is recommended.

Why Genuine Mazda? Genuine Mazda transmission components are designed to match the original six-speed gearbox specification, selector-rail geometry, synchroniser arrangement and internal clearances. Correct dimensions, material quality and manufacturing tolerances help maintain accurate gear engagement, geartrain compatibility and reliable shift operation.

What’s in the box: One Genuine Mazda fifth-gear and reverse selector fork, part number P601-17-406.

Installation notes: Remove and dismantle the gearbox in accordance with the appropriate Mazda workshop procedure. Inspect the selector rail, synchroniser components, engagement teeth, bearings and related transmission parts for associated wear or damage. Lubricate internal components during assembly, observe all specified clearances and torque settings, seal the transmission casing correctly and refill it with the specified gearbox oil before operation.