ZF 1211.304.029 SHIM for WG150 | OEM Genuine Part

Overview

The ZF 1211.304.029 SHIM is a precision-engineered adjustment component designed specifically for the WG150 series transmission. This OEM genuine part, identified by SKU 1211.304.029, is installed between the transmission housing and bearing assemblies to establish precise axial clearances and preload tolerances. By compensating for manufacturing variances, this shim ensures optimal gear mesh alignment and load distribution across the drivetrain. It is frequently replaced during a full transmission rebuild alongside the 4642101108: TRANSMISSION HOUSING or the 4642301208: TRANSMISSION HOUSING to restore factory-specified tolerances.

Symptoms of Failure

• Excessive axial play in output shaft: When the 1211.304.029 shim compresses or corrodes, noticeable end-play develops in the main shaft, causing vibration during acceleration.
• Low-frequency gear whine under load: Worn shims allow gear faces to misalign, producing a distinct humming noise that intensifies with torque application.
• Intermittent clutch pack slippage: Incorrect shim thickness alters hydraulic piston travel, leading to delayed engagement or slipping in higher gears.
• Oil contamination from metal debris: A degraded shim sheds fine metallic particles into the fluid, often detected during routine filter inspections.

Technical Specifications

Compatibility

This shim is engineered for the ZF WG150 series but also fits select models in the WG180 and WG200 families where identical bearing preload specifications apply. It is commonly used in WG150, WG180, and WG200 transmissions found in municipal trucks, fire apparatus, and heavy-duty off-road equipment. For proper installation, ensure the mating 0730365125: TYPE PLATE is legible for correct model identification, and verify that the 0631311009: GROOVED STUD is torqued to factory specifications to prevent shim displacement.

Related Components