Overview
The ZF 1272.335.017 SPEEDO.BUSH is a precision-engineered bushing designed for the speedometer drive assembly within ZF WG180 and WG200 series transmissions. This OEM genuine part ensures accurate rotational signal transmission from the output shaft to the speedometer sensor, directly affecting vehicle speed readouts and shift timing. The SKU 1272.335.017 sits inside the 4644101080 TRANSMISSION HOUSING, where it interfaces with the output shaft to provide a stable bearing surface for the speedometer drive gear. Without this bushing, the speedometer gear cannot maintain proper alignment, leading to erratic readings or complete signal loss.
Symptoms of Failure
When the ZF 1272.335.017 SPEEDO.BUSH wears out, operators typically notice these specific failure modes:
- Erratic speedometer needle fluctuation – The needle jumps or drops unexpectedly during steady cruising, often caused by bushing wear allowing the drive gear to wobble.
- Oil seepage from the speedometer housing area – A worn bushing compromises the seal between the 4644301333 HOUSING and the output shaft, allowing transmission fluid to leak past the O-ring.
- Intermittent speed signal loss – The transmission control unit loses vehicle speed data, triggering a check engine light and forcing the transmission into limp mode.
- Grinding noise from the rear of the transmission – Metal-to-metal contact occurs when the bushing material degrades, producing a distinct metallic scraping sound during deceleration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 1272.335.017 |
| Material | Sintered bronze with PTFE impregnation |
| Inner Diameter | 28.0 mm |
| Outer Diameter | 35.0 mm |
| Length | 22.5 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 1272.335.017 |
| Hardness | HRB 60-70 |
Compatibility
This bushing is engineered for ZF WG180 and WG200 series transmissions, including all sub-variants such as WG180-110, WG180-120, WG200-110, and WG200-130. It also fits certain ZF Ecomat 4HP and 5HP models that share the same speedometer drive architecture. The part is not compatible with ZF AS Tronic or PowerShift series without adapter modifications. Always verify the 0730365125 TYPE PLATE on your transmission to confirm model identification before ordering. The bushing mounts directly onto the 0631311009 GROOVED STUD that secures the speedometer drive assembly within the housing.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644101080 | TRANSMISSION HOUSING | Main structural casing housing all internal components |
| 4644301333 | HOUSING | Secondary housing for speedometer and sensor assembly |
| 0730365125 | TYPE PLATE | Identification plate with transmission model and serial number |
| 0631311009 | GROOVED STUD | Mounting stud for speedometer drive gear retention |
| 0636305019 | SCREW PLUG | Sealing plug for speedometer housing access port |
| 4644301247 | THREADED BUSH | Threaded insert for sensor mounting threads |
| 0634303485 | O-RING | Seal between speedometer housing and transmission case |
| 4644106231 | SHIFT SYSTEM | Complete shift mechanism assembly |
| 4644306470 | GASKET | Housing-to-case sealing gasket |
| 4644306194 | COVER PLATE | Access cover for speedometer drive service |
