Overview
The ZF 4143.203.010 OUTPUT FLANGE is a critical driveline component engineered to transfer rotational torque from the transmission’s output shaft to the driveshaft or differential. Positioned at the rear of the gearbox housing, this OEM genuine part ensures a precise, vibration-free connection that maintains drivetrain alignment under heavy loads. The SKU 4143.203.010 is specifically designed for ZF’s HL 100 Series and HL 270 Series transmissions, where it interfaces directly with the 4143101009: HOUSING and the 4143301025: HOUSING to form a sealed, robust assembly. A worn output flange compromises the entire power transfer path, making this part essential for maintaining operational uptime in industrial and marine applications.
Symptoms of Failure
- Oil leakage at the rear seal interface: A degraded flange mating surface or worn splines allow transmission fluid to escape, often visible as drips near the output housing. This is a common long-tail search query for “ZF transmission rear oil leak repair.”
- Driveline vibration during acceleration: When the flange’s pilot bore or bolt pattern becomes distorted, it causes imbalance, leading to shuddering at specific RPM ranges—often searched as “ZF output flange vibration symptoms.”
- Clunking noise on gear engagement: Excessive play between the flange splines and the output shaft produces a metallic knock when shifting from neutral to drive, a classic sign of “worn ZF transmission output flange noise.”
- Intermittent power loss or slipping: A cracked flange can cause the driveshaft to partially disengage under load, resulting in “ZF transmission slipping under load” issues that worsen over time.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number / SKU | 4143.203.010 |
| Material | Forged alloy steel (induction-hardened spline) |
| Outer Diameter | ~180 mm (7.09 in) |
| Overall Length | ~95 mm (3.74 in) |
| Pilot Bore Diameter | ~45 mm (1.77 in) |
| Bolt Circle (PCD) | 4 x 14 mm holes on 130 mm PCD |
| Weight | ~2.8 kg (6.2 lbs) |
| OEM Reference | ZF 4143.203.010 |
| Sealing Surface | Ground finish for 0634313603: O-RING compatibility |
Compatibility
This output flange is engineered for ZF’s HL 100 and HL 270 transmission series, which are widely used in heavy-duty trucks, construction loaders, and marine propulsion systems. Based on its spline count and bolt pattern, it is also compatible with the following ZF models: WG180, WG200, Ecomat 4HP, and 6HP series (where a similar rear output configuration is used). Always verify the spline count (typically 24 or 32 splines) against your transmission’s output shaft. The flange mounts directly to the 4475280018: SCREW PLUG port for pressure testing and requires a new 0634313603: O-RING during installation to prevent leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4143101009 | HOUSING | Encloses the output shaft and flange assembly |
| 4143301025 | HOUSING | Rear housing section supporting the output bearing |
| 0634313603 | O-RING | Seals the flange-to-housing interface |
| 4475280018 | SCREW PLUG | Closes the pressure test port on the housing |
| 0501342341 | SUPPORT RING | Reinforces the O-ring groove against extrusion |
| 4143298457 | SEAL KIT | Contains all seals for a complete output rebuild |
| 0634313591 | O-RING | Secondary seal for the housing cover plate |
| 0636101068 | CAP SCREW | Fastens the flange to the output shaft hub |
| 4143221013 | THROTTLE VALVE | Controls hydraulic pressure for shift timing |
| 0634304484 | O-RING | Seals the throttle valve bore in the valve body |
