A rattling noise is coming from the transmission whenever the engine is running and the transmission is in gear.
Too much clearance develops between the pinion bearing and the park gear—refer to figure 1, above—which causes the park gear to rattle against the differential pinion gear.
Superior Transmission Products offers a park gear anti-rattle shim that is installed in between the pinion bearing and the park gear; refer to figure 14. The shim reduces the clearance to .001 to .002 which eliminates the rattle noise. The part number is STL005, and there are three to a package.
Figure 2 details:
- Differential pinion gear bearings (two required)
- Parking gear
- Differential pinion gear and shaft assembly
- Transfer driven gear
- Transfer driven gear snap ring