Overview
The ZF 4661.374.007 INNER DISK CARRIER is a critical rotating component within the WG 94 series transmission. It serves as the structural hub that houses and aligns the clutch friction discs and steel separator plates within the multi-disc clutch pack. Precision-machined from high-strength alloy steel, this carrier ensures even load distribution during gear shifts, preventing torsional vibration that can degrade shift quality. As an OEM genuine part, the 4661.374.007 is engineered to exact factory tolerances for direct replacement without modification. It mounts directly onto the transmission main shaft and interfaces with the 4661101013: TRANSMISSION HOUSING to form a sealed, pressurized clutch chamber.
Symptoms of Failure
- Delayed or harsh gear engagement: A worn carrier spline or distorted disk pocket causes uneven clutch pack pressure, leading to noticeable lag or jerking when shifting from neutral to drive.
- Transmission oil contamination with metallic debris: Fretting wear on the carrier’s spline teeth sheds fine metal particles into the hydraulic circuit, visible during oil changes as glitter in the fluid.
- Intermittent clutch slip under load: When the carrier’s internal splines strip or crack, the clutch pack loses clamping force, causing the transmission to slip during uphill climbs or heavy hauling.
- Abnormal whining or grinding noise from the bell housing: A cracked carrier produces a rhythmic metallic noise that increases with engine RPM, often misdiagnosed as a bearing failure.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4661.374.007 |
| OEM Reference | ZF 4661.374.007 |
| Material | Case-hardened alloy steel (20MnCr5 equivalent) |
| Outer Diameter | 195 mm |
| Inner Spline Diameter | 42 mm |
| Overall Height | 68 mm |
| Disk Pocket Width | 5.2 mm (6 pockets) |
| Weight | 2.4 kg |
| Surface Finish | Phosphate coated for corrosion resistance |
Compatibility
This inner disk carrier is specifically designed for the ZF WG 94 series, including the WG94, WG180, and WG200 models. It is also compatible with select ZF Ecomat 4HP and 5HP variants that share the same clutch pack architecture. The carrier interfaces directly with the 4661301022: HOUSING and is secured using a 0631306174: CYLINDRICAL PIN for rotational alignment. Always verify the transmission serial number against the 0769123894: TYPE PLATE to confirm compatibility before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101013 | TRANSMISSION HOUSING | Encloses the gear train and clutch assembly |
| 4661301022 | HOUSING | Intermediate housing supporting the clutch drum |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for carrier-to-housing positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals hydraulic test ports on the housing |
| 4660201008 | SCREW PLUG | Oil drain plug for the clutch chamber |
| 0636100117 | SCREW PLUG | Pressure tap plug for diagnostic testing |
| 0501211384 | VALVE | Modulates clutch apply pressure |
| 0732042156 | COMPRESSION SPRING | Returns valve spool to neutral position |
| 0636100820 | SCREW PLUG | Seals the valve body bore |
