How to fix GM 6T70/Ford 6F50 rattling noise with transmission in gear - Transmission Digest

How to fix GM 6T70/Ford 6F50 rattling noise with transmission in gear

A rattling noise is coming from the transmission whenever the engine is running and the transmission is in gear.

The complaint

A rattling noise is coming from the transmission whenever the engine is running and the transmission is in gear.

The cause

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.

The correction

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.

Tech-Talk-Q4-Figure-14-1400
Figure 2.

Figure 2 details:

  1. Differential pinion gear bearings (two required)
  2. Parking gear
  3. Differential pinion gear and shaft assembly
  4. Transfer driven gear
  5. Transfer driven gear snap ring

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