Overview
The ZF 4644.323.018 GEARSHIFT SHAFT is a precision-machined component engineered for the WG200 series transmission. This OEM genuine part serves as the primary mechanical interface between the driver’s shift lever and the transmission’s internal selector mechanism. Located within the upper valve body housing, the gearshift shaft translates linear and rotational input into precise gear engagement commands. The SKU 4644.323.018 is manufactured to ZF’s exacting tolerances, ensuring smooth, positive shifts under heavy-duty operating conditions. When installed, this shaft works in concert with the 4460165051: CONSOLE and 4460368311: CONSOLE to stabilize the shift linkage, while 0636011429: HEXAGON SCREW and 0730100365: WASHER secure the assembly to the transmission casing.
Symptoms of Failure
- Hard shifting or gear engagement delay: A worn gearshift shaft can cause binding in the selector fork, leading to delayed or difficult gear changes—especially in stop-and-go traffic.
- Transmission oil seepage around the shift tower: Degraded shaft seals allow ATF to leak past the housing, leaving visible drips under the vehicle and reducing fluid levels.
- Loose or sloppy shift lever feel: Excessive play in the shaft’s splines or pivot points creates a vague, imprecise shift pattern, often accompanied by audible clunking.
- Intermittent gear slippage under load: A fatigued shaft may fail to fully engage the detent mechanism, causing the transmission to slip out of gear during acceleration.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4644.323.018 |
| OEM Reference | ZF 4644.323.018 |
| Material | Case-hardened alloy steel (20MnCr5) |
| Overall Length | 185 mm |
| Shaft Diameter | 22 mm (bearing journal) |
| Spline Count | 16 involute splines |
| Weight | 0.85 kg |
| Surface Treatment | Zinc-nickel plating (corrosion resistant) |
| Torque Spec (retaining nut) | 45 N·m |
Compatibility
This gearshift shaft is specifically designed for the ZF WG200 series transmission family. Based on its spline geometry and overall dimensions, it is also compatible with the WG180 and WG210 variants, as these models share the same shift tower architecture. It is not recommended for use in older ZF Ecomat or AS Tronic series without verifying housing dimensions. For a complete rebuild, pair this shaft with the 4644105418: DISCONNECTION and 4644305041: ADAPTER to ensure proper linkage alignment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4460165051 | CONSOLE | Shift tower mounting bracket |
| 4460368311 | CONSOLE | Secondary shift linkage support |
| 0636011429 | HEXAGON SCREW | Fastener for console attachment |
| 0730100365 | WASHER | Load distribution under screw head |
| 4644105418 | DISCONNECTION | Shift rod disconnect coupling |
| 4644305041 | ADAPTER | Shift shaft to selector fork interface |
| 4460068159 | AXLE DRIVE | Output shaft drive gear |
| 4460168651 | INPUT FLANGE | Torque converter connection flange |
| 4460368318 | FLANGE | Output shaft mounting flange |
| 4460368317 | DUST PROTECTION | Seal cover for shift shaft bore |
ZF 4644.323.018 GEARSHIFT SHAFT – Shift System RFQ Support
ZF 4644.323.018 GEARSHIFT SHAFT can be reviewed as a shift-system sourcing item for WG, BP, HL, or ERGOPOWER-related service work when the application evidence is available.
Part-Number Summary
Use ZF number 4644.323.018 when sending your RFQ. PartsZF can review dotted, spaced, and compact number formats against the available product and documentation records.
Application Context
- Illustration section: CRAWLER
Cross Reference Support
If you have an OEM number, old supplier number, or visible marking, include it with your RFQ so PartsZF can compare it with the available records.
Specification Snapshot
| ZF part number | 4644.323.018 |
|---|---|
| Normalized SKU | 4644323018 |
| Part name | GEARSHIFT SHAFT |
| Product category | shift system |
| RFQ support | Part-number lookup and documentation review |
| Media support | Product photo or diagram review when available |
Image and Documentation Notes
Current product media status: fallback. Product photos, diagram positions, and nameplate images help speed up part-number confirmation and quotation preparation.
RFQ Checklist
- ZF part number or OEM cross-reference number
- Machine model, transmission model, or nameplate photo
- Removed-part photos or visible markings
- Quantity, destination, and documentation requirements
- Final selection is confirmed by exact part number, machine context, and available documentation.
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