ZF 4644.305.010 SLIDING SLEEVE for WG160/WG200 | OEM Genuine Part

Overview

The ZF 4644.305.010 SLIDING SLEEVE is a critical synchronizer component engineered for the WG160, WG200, and related heavy-duty transmission series. This OEM genuine part functions as the mechanical bridge between the shift fork and the gear hub, enabling smooth engagement and disengagement of gear ratios during operation. Positioned directly within the main shaft assembly, the sliding sleeve (SKU: 4644.305.010) translates axial movement from the shift mechanism into rotational lock-up with the gear clutch teeth. When paired with a properly functioning DISCONNECTION (4644105417), this sleeve ensures precise power flow control across the transmission’s operating range.

Symptoms of Failure

• Hard shifting or gear clash: A worn 4644.305.010 sliding sleeve fails to engage clutch teeth cleanly, causing grinding noises during gear changes, especially under load.
• Unexplained gear slippage: When the sleeve’s internal splines wear down, the transmission may pop out of gear under torque, a condition often misdiagnosed as a shift fork issue.
• Metallic debris in transmission oil: Flaking or chipping of the sleeve’s hardened surface introduces fine steel particles into the lubricant, detectable during routine oil changes.
• Intermittent loss of drive in specific gears: A cracked or deformed sliding sleeve can prevent full engagement of a particular gear set, leading to intermittent power loss that worsens with heat.

Technical Specifications

Compatibility

This sliding sleeve is a direct-fit OEM replacement for the following ZF transmission families: WG 160 Series, WG 190 Series, WG 200 Series, and WG 210 Series. It is specifically validated for use in WG160 and WG200 main boxes where the synchronizer assembly requires a 36-tooth internal spline pattern. The part also interfaces with the OUTPUT FLANGE (4644303547) and the OUTPUT FLANGE (4644303012) in rear-mounted configurations. Always verify the shift fork geometry and TRANSMISSION HOUSING (4644101121) compatibility before installation.

Related Components

Frequently Asked Questions

Q: Can the 4644.305.010 sliding sleeve be reused after a transmission rebuild?
A: ZF engineering recommends replacing this sleeve during any major overhaul. The case-hardened surface wears microscopically with each shift cycle, and reuse increases the risk of premature gear disengagement.

Q: Does this part fit both WG160 and WG200 transmissions without modification?
A: Yes, the 4644.305.010 is dimensionally identical for both series. However, you must verify the shift fork width (typically 8 mm) and the condition of the mating hub splines before installation.

Q: What torque specification applies to the retaining snap ring for this sleeve?
A: The snap ring groove is designed for a standard 2.5 mm thick ring. No torque is applied to the sleeve itself; instead, ensure the ring is fully seated in its groove with zero axial play.