Overview
The ZF 4644.308.366 SHEET is a critical structural component engineered for the WG180, WG181, WG200, and WG201 series transmissions. This OEM genuine part functions as a precision-formed shim or cover sheet, positioned between the TRANSMISSION HOUSING and the internal valve body assembly. Its primary role is to maintain exacting axial clearances, ensuring proper hydraulic pressure distribution and preventing metal-on-metal contact during gear shifts. The SKU 4644.308.366 is manufactured to ZF’s original tolerances, guaranteeing a direct fit without modification. This sheet is often replaced during a full transmission overhaul or when addressing persistent oil seepage at the housing interface.
Symptoms of Failure
- External oil leaks at the housing seam: A worn or deformed 4644.308.366 sheet allows transmission fluid to weep past the DISCONNECTION joint, leaving visible drips under the vehicle.
- Erratic gear engagement or slipping: When the sheet loses its dimensional integrity, internal clearances shift, causing delayed clutch pack application and a “slipping” sensation during acceleration.
- Increased operating noise (whining or humming): A compromised sheet fails to dampen vibration between the OUTPUT FLANGE and the housing, transmitting audible gear whine into the cabin.
- Contaminated transmission fluid: Cracks in the sheet can allow debris to bypass the filter, leading to premature wear of the HEXAGON SCREW fasteners and valve body components.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.308.366 |
| Material | Cold-rolled spring steel (DIN 17222) |
| Thickness | 0.50 mm ± 0.05 mm |
| Outer Diameter | 180 mm (approx.) |
| Weight | 0.085 kg |
| OEM Reference | ZF 4644.308.366 |
| Surface Finish | Phosphate-coated for corrosion resistance |
Compatibility
This genuine ZF sheet is specifically designed for the following transmission models: WG 180 Series, WG 181 Series, WG 200 Series, and WG 201 Series. It is not interchangeable with earlier WG 120 or WG 150 variants due to differences in housing bolt patterns. Always verify the casting number on your existing TRANSMISSION HOUSING before ordering. The 4644.308.366 sheet is also a direct replacement for units equipped with the OUTPUT FLANGE (part 4642303093) and the DISCONNECTION assembly (part 4644105413).
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105413 | DISCONNECTION | Clutch disconnection mechanism |
| 4642303093 | OUTPUT FLANGE | Transmission output shaft coupling |
| 0636021010 | HEXAGON SCREW | Housing fastening bolt |
| 4644101222 | TRANSMISSION HOUSING | Main transmission casing |
| 4644301226 | TRANSMISSION HOUSING | Alternate housing variant |
| 0730365067 | TYPE PLATE | Identification and rating plate |
| 0631311009 | GROOVED STUD | Alignment and mounting stud |
| 4644301298 | COVER PLATE | Access cover for valve body |
| 0634306525 | O-RING | Hydraulic seal for fluid passages |
| 0636305026 | SCREW PLUG | Drain or fill port plug |
