GMT900 Steering Slop and Front End Wear — Full Breakdown
Loose steering, a clunky front end, or uneven tire wear on your GMT900 are classic signs that front suspension components are worn. These trucks are now 10–17 years old, and many have never had front end work done. If your truck has over 150,000 km, this is worth a full inspection.
Common Symptoms
- Steering wheel play or looseness — the wheel moves before the truck responds
- Clunk or knock when turning, especially at low speed or full lock
- Steering wander at highway speed
- Uneven or feathered tire wear
- Pulling to one side
- Vibration through the steering wheel
What’s Wearing Out
Tie Rod Ends (Inner and Outer)
The most common failure on high-mileage GMT900 trucks. Outer tie rod ends take the most abuse and wear first. Inner tie rods are often overlooked but fail just as often.
Symptoms: Steering play, vague steering response, clunking when turning
Idler Arm / Pitman Arm
The idler arm controls lateral movement of the center link. When it wears, the entire steering system develops play.
Symptoms: Steering wander, side-to-side looseness
Steering Intermediate Shaft
This is one of the most overlooked components on GMT900 trucks. The intermediate shaft (also called the “rag joint” or steering shaft) develops play and causes a distinct in-cabin clunk, particularly when reversing or when making small steering corrections.
Symptoms: Clunk felt through the steering wheel over bumps or when lightly rocking the wheel back and forth
Control Arm Bushings
Upper and lower control arm bushings wear over time. When they go, it affects alignment, handling, and causes noise over bumps.
Symptoms: Creaking or knocking over bumps, alignment pulling even after a fresh alignment
Ball Joints
Upper and lower ball joints are critical safety components. Failed ball joints can cause catastrophic loss of control.
Symptoms: Clunk when going over bumps, looseness in the wheel when lifted, uneven tire wear
How to Fix It
Full Front End Rebuild — In most cases, a complete rebuild makes more sense than replacing one component at a time. If one part is worn, the others aren’t far behind.
A proper GMT900 front end rebuild typically includes:
- Inner and outer tie rod ends (both sides)
- Idler arm and pitman arm
- Upper and lower ball joints
- Control arm bushings (or full control arms)
- Steering intermediate shaft (if clunking)
Brand recommendation: Moog Problem Solver series is the go-to for GM truck front end components. They offer upgraded geometry and materials that outlast the OEM parts.
Grease zerks: Many Moog parts include grease fittings. Grease every 10,000 km to significantly extend part life.
After Repair: Alignment is Mandatory
A fresh 4-wheel alignment is required after any front end work. Skipping alignment after replacing tie rods or control arm components will cause premature tire wear and poor handling.
Budget $120–$200 for a proper 4-wheel alignment at a reputable shop.
Bottom Line
If your GMT900 has vague steering, a clunk over bumps, or highway wander, do a full front end inspection before putting it off. These parts don’t get better on their own. A complete rebuild with quality parts and a proper alignment will make the truck feel like new.
Don’t forget the intermediate steering shaft — it’s cheap to replace and makes a massive difference in steering feel.
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