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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Automatic Transmission - 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Noise in Fourth, Fifth, or Sixth Gear

Noise in Fourth, Fifth, or Sixth Gear

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Checks Causes
Input Sun Gear Thrust Washer (55) Inspect for wear or damage.
Turbine Shaft Thrust Bearing Assembly (57) Inspect for wear or damage.
4 - 5 - 6 Clutch (with Output Carrier Shaft and Dampener) Hub Assembly (58)
  • Inspect for damaged or worn 4 - 5 - 6 clutch backing plate (432).
  • Inspect for improper selective 4 - 5 - 6 clutch backing plate retaining ring (431).
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