GM Service Manual Online
For 1990-2009 cars only

Proper Application and Availability of Ball Studs for Aluminum vs. Cast Iron Front Lower Control Arms

Subject:Proper Application and Availability of Ball Studs for Aluminum vs. Cast Iron Front Lower Control Arms

Models:2007-2008 Cadillac Escalade, Escalade EXT
2007-2008 Chevrolet Avalanche, Tahoe (1500 Series)
2007-2008 GMC Yukon (1500 Series)



Background

For the 2007 and 2008 model years, 1500 series light duty utility vehicles are built concurrently with both aluminum and cast iron front lower control arms. Either style of lower control arms perform the same function, but requires specific ball stud service parts if replacement is required.

Service Parts Availablility

Currently, the only ball studs available as service replacements in the GM Parts Catalog are intended for the cast iron lower control arms. P/N 15922557 should be used as replacements in the cast iron control arms only. If these ball studs are used in the aluminum control arms, they may not provide service life equal to the original components.

Important: P/N #15922557 should be used as replacements in the cast iron control arms only.

How to Service Lower Control Arm Ball Studs Properly

If a vehicle with Aluminum Lower Control Arms requires service:

    • You should replace the entire lower control arm with new P/N 25788110 (Left) or 25788111 (Right). These aluminum lower control arms have the proper ball studs pre-installed.
    • If a vehicle with aluminum control arms has already been serviced with P/N 15922557, the lower control arm should be replaced.

If a vehicle with cast iron lower control arms requires service, you should replace only the ball studs with P/N 15922557.

Parts Information

Part Number

Description

25788110

Control Arm Front Lower (Aluminum, Left)

25788111

Control Arm Front Lower (Aluminum, Right)

15922557

Stud, Ball (For Cast Iron ONLY)