Overview
The ZF 4651.107.001 SPEEDOMETER is a precision-engineered OEM genuine component designed specifically for the WG 100 series transmission family. This critical sensor unit monitors output shaft rotational speed, transmitting real-time data to the vehicle’s dashboard and electronic control unit. Positioned within the rear housing assembly, the speedometer ensures accurate vehicle velocity readings and supports proper shift timing. The SKU 4651.107.001 is a direct factory replacement, guaranteeing seamless integration with your existing transmission architecture. When paired with a robust 4651101004: TRANSMISSION HOUSING, this part maintains the integrity of the drivetrain monitoring system.
Symptoms of Failure
- Erratic or zero speedometer readings: A worn 4651.107.001 often causes the needle to bounce, drop to zero intermittently, or remain stuck, making it difficult to gauge vehicle speed accurately.
- Transmission shift hesitation or harsh engagement: When the speed sensor fails, the control module lacks proper input, leading to delayed upshifts or abrupt downshifts, especially under load.
- Check engine or transmission warning light activation: Faulty speedometer output triggers diagnostic trouble codes (DTCs) related to input/output speed correlation, illuminating dashboard alerts.
- Incorrect odometer accumulation: A failing unit may under-report or over-report distance traveled, skewing maintenance intervals and fuel economy calculations.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number (SKU) | 4651.107.001 |
| OEM Reference | ZF Genuine |
| Material | Hardened steel shaft with composite gear |
| Weight | 0.45 kg (1.0 lb) |
| Overall Length | 95 mm |
| Drive Gear Diameter | 28 mm |
| Seal Type | Integrated O-ring (compatible with 0634303928: O-RING) |
| Operating Temperature Range | -40°C to +120°C |
Compatibility
This speedometer is primarily engineered for the ZF WG100 series, but its mounting pattern and gear ratio also suit several other ZF transmissions. It is a direct fit for the WG100, WG120, and WG150 models. Additionally, it has been verified for use in the WG180 and WG200 series when paired with the correct 4651301014: HOUSING adapter. For heavy-duty applications, ensure the mating 4651301008: TRANSMISSION HOUSING is free of wear to prevent premature failure. Always confirm your transmission serial number before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101004 | TRANSMISSION HOUSING | Main structural casing for gear sets |
| 4651301014 | HOUSING | Rear cover and speedometer mounting base |
| 0634303928 | O-RING | Seals speedometer shaft bore |
| 4651301008 | TRANSMISSION HOUSING | Alternative housing for WG180/200 |
| 4651203002 | SCREEN SHEET | Oil filter mesh for debris protection |
| 4651303005 | SCREEN SHEET | Secondary oil strainer element |
| 0636101032 | CAP SCREW | Fastener for housing assembly |
| 0630361028 | SEALING CAP | Closes unused sensor ports |
| 0636304032 | SCREW PLUG | Drain or fill port closure |
| 0634303312 | O-RING | Seals housing mating surfaces |
