Overview
The ZF 4642.303.008 BUSH is a precision-engineered bearing component designed for the WG 100 Series transmission family. This OEM genuine part serves as a critical wear surface within the planetary gearset assembly, reducing friction between rotating shafts and stationary housings. The SKU 4642.303.008 ensures exact dimensional tolerances required for proper oil flow and load distribution. When installed alongside a TRANSMISSION HOUSING (4651101009), this bushing maintains concentric alignment that prevents premature gear tooth wear. It is also frequently replaced in conjunction with the HOUSING (4651301025) during major overhauls.
Symptoms of Failure
- Low-frequency growling noise during acceleration: A worn 4642.303.008 bushing allows shaft deflection, creating metal-on-metal contact that produces a distinct rumbling sound, especially under load in WG100 transmissions.
- Gradual oil pressure drop in the main circuit: Excessive clearance from bushing wear increases internal leakage, causing the transmission to slip between gears and triggering “low pressure” diagnostic codes.
- Metallic debris in the oil pan: Flaking bronze or steel particles from a failing bushing contaminate the hydraulic system, often requiring replacement of the O-RING (0634303928) and HOUSING (4651301031) to prevent secondary damage.
- Intermittent gear engagement delay: Worn bushings cause shaft misalignment that disrupts clutch pack timing, resulting in harsh or delayed shifts when the transmission is hot.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4642.303.008 |
| Inner Diameter | 38.10 mm (1.500 in) |
| Outer Diameter | 44.45 mm (1.750 in) |
| Length | 25.40 mm (1.000 in) |
| Material | Phosphor bronze (SAE 841) |
| Weight | 0.045 kg (0.10 lbs) |
| OEM Reference | ZF 4642.303.008 |
| Hardness | HRB 60-80 |
Compatibility
This bushing is specifically engineered for the ZF WG 100 Series, including models WG100, WG120, WG150, WG180, and WG200. It is a direct replacement for the OEM part in all WG-series transmissions produced after 1998. The 4642.303.008 fits both standard and heavy-duty variants. Always verify the bushing bore condition in the TRANSMISSION HOUSING (4651101009) before installation, as housing wear may necessitate replacement of the HOUSING (4651301025) or HOUSING (4651301031) to ensure proper fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101009 | TRANSMISSION HOUSING | Main structural casing for gearset |
| 4651301025 | HOUSING | Intermediate support housing |
| 0634303928 | O-RING | Seals bushing bore against oil leaks |
| 4651301031 | HOUSING | Rear planetary carrier housing |
| 4651203002 | SCREEN SHEET | Filters debris from oil circuit |
| 4651303005 | SCREEN SHEET | Secondary filtration screen |
| 0636101032 | CAP SCREW | Fastens housing to transmission case |
| 0630361028 | SEALING CAP | Closes oil passage ports |
| 4475280060 | SCREW PLUG | Seals threaded inspection holes |
| 0634303312 | O-RING | Seals screw plug against pressure loss |
