Overview
The ZF 4166.337.112 STATOR HUB is a critical torque multiplication component within the WG 65 series transmission. Positioned between the pump and turbine in the torque converter assembly, this OEM genuine part directs hydraulic fluid flow to maximize low-end torque during vehicle launch. The SKU 4166.337.112 is engineered to precise ZF tolerances, ensuring that the stator remains locked against the one-way clutch under load while freewheeling during coupling phase. This hub interfaces directly with the 4616105402: OUTPUT shaft assembly and is housed within the 4616101119: TRANSMISSION HOUSING, making it a non-negotiable element for maintaining proper converter lockup and shift timing.
Symptoms of Failure
- Torque converter shudder or vibration during acceleration: A worn stator hub allows excessive axial play, causing the stator to intermittently contact the turbine, producing a low-frequency shudder under load.
- Delayed or harsh forward engagement: When the stator hub splines strip or the one-way clutch race wears, hydraulic pressure drops, leading to a noticeable lag when shifting from Neutral to Drive.
- Transmission overheating and fluid discoloration: A failing stator hub cannot properly redirect oil flow, causing the converter to slip excessively and generate heat, often turning the ATF dark or burnt-smelling.
- Intermittent loss of power on grades: As the hub loses its ability to multiply torque, the vehicle may struggle to maintain speed on inclines, mimicking a slipping clutch pack.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4166.337.112 |
| OEM Reference | ZF 4166.337.112 |
| Material | High-strength sintered steel with hardened spline teeth |
| Outer Diameter | 112 mm |
| Inner Spline Diameter | 28 mm |
| Overall Height | 48 mm |
| Weight | 0.85 kg (1.87 lbs) |
| One-Way Clutch Type | Sprag or roller (dependent on converter variant) |
| Torque Capacity | Up to 650 Nm (estimated for WG65) |
Compatibility
This ZF 4166.337.112 STATOR HUB is specifically designed for the WG 65 Series transmission family. Based on its spline count and hub diameter, it is also compatible with the following ZF models that share the same torque converter architecture: WG180, WG200, and WG250. It is frequently replaced alongside the 4005303005: OUTPUT FLANGE and secured using the 0636011038: HEXAGON SCREW during a full converter rebuild. Always verify the one-way clutch freewheel direction (clockwise vs. counterclockwise) before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4616105402 | OUTPUT | Transfers torque from converter to planetary gearset |
| 4005303005 | OUTPUT FLANGE | Connects transmission output to driveshaft |
| 4616101119 | TRANSMISSION HOUSING | Encloses all rotating components and oil circuits |
| 0636011038 | HEXAGON SCREW | Secures stator hub to one-way clutch race |
| 0636011118 | HEXAGON SCREW | Fastens converter cover to pump drive |
| 0636016015 | HEXAGON SCREW | Mounts stator support to housing |
| 0631306085 | CYLINDRICAL PIN | Aligns stator hub with one-way clutch |
| 0634313118 | O-RING | Seals stator hub bore against oil leakage |
| 0636304019 | SCREW PLUG | Closes oil passages in stator support |
| 0634801152 | SEALING RING | Prevents converter drain-back at hub interface |
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