GM Service Manual Online
For 1990-2009 cars only

Noise in First, Second, Third, Fourth, Fifth, or Reverse Gear for Cadillac STS 2008

Checks

Causes

Input Carrier Assembly (52)

Inspect thrust washers, pinion gears, and pins for wear or damage.

Input Sun Gear (53)

Inspect for damaged sun gear.

1-2-3-4 and 3-5-R Clutch Assembly (51)

Inspect for worn or damaged clutch bearing (428).