2007 Grand Prix GXP Rear Suspension Parts List: What You Need to Know

The 2007 Pontiac Grand Prix GXP came with a sport-tuned suspension featuring FE3 or FE5 (depending on package), stiffer springs, and upgraded dampers. If you own one and are tackling a rear suspension overhaul or upgrade, you need a clear parts list. This article covers every major component, common symptoms of wear, and what to look for when replacing parts.

Rear Struts and Shock Absorbers

The GXP uses a fully independent rear suspension with struts (not separate shocks). The rear strut assembly includes the spring seat, mounting hardware, and sometimes the spring itself. Aftermarket options include:

• KYB Excel-G (replacement OE-style)
• Monroe OESpectrum (higher performance)
• ACDelco Professional (factory direct replacement)

When replacing, consider replacing the strut mounts and dust boots as well. The strut mount bearing can wear over time, causing noise.

Rear Coil Springs

The GXP rear springs are unique due to the heavier engine and sport suspension. Aftermarket options include:

• Moog (variable rate springs)
• Eibach Pro-Kit (lowering springs, about 1.2 inch drop)
• H&R Sport (also for lowering)

If you are just replacing worn springs, stick with stock rate Moog or AC Delco. For improved handling with slightly lower ride height, lowering springs work well but may require bump stops.

Rear Control Arms

The GXP rear suspension has two lower control arms (each side) and a stabilizer bar. The lower arms can have worn bushings that cause clunking or vague steering. Parts to consider:

• Moog Problem Solver lower control arms with pre-installed ball joints and bushings
• ACDelco Professional genuine parts
• Aftermarket polyurethane bushings (if you press out old ones)

Note: The GXP does not have upper control arms; it uses a multi-link design with lateral links. These also have bushings that can wear.

Stabilizer Bar (Sway Bar) and End Links

The rear sway bar reduces body roll. The GXP rear bar is hollow and 21mm in diameter. Parts to check:

• Sway bar bushings – Moog or Energy Suspension polyurethane replacements
• End links – Moog (greasable) or AC Delco (OE style)

If the bar is bent or cracked, a replacement is necessary, but aftermarket bars are rare for this platform.

Rear Bushings (Control Arm, Trailing Arm)

Most rear suspension noise comes from worn bushings. The trailing arm (or LCA) bushings are common failure points. Options:

• Prothane polyurethane bushing set – firmer but longer lasting
• Energy Suspension master bushing kit
• Moog rubber bushings (OE ride quality)

Bushing replacement requires pressing out the old and new – many owners simply replace the entire control arm assembly to save time.

Rear Hub and Wheel Bearing Assembly

The 2007 Grand Prix GXP uses a rear wheel hub assembly integrated with the bearing. Symptoms include humming, play, or ABS issues. Part numbers:

• Timken HA590260 (reluct to trust, but widely used)
• ACDelco 51-1008 (GM original)
• SKF (premium choice)

When replacing, always use new axle nuts and torque to spec (160 lb-ft).

Rear Brake Components (for context)

While not strictly suspension, when working on the rear you often replace brake pads and rotors. The GXP has rear disc brakes. Pads: Wagner ThermoQuiet or Power Stop Z17. Rotors: AC Delco or Raybestos. Always check the caliper condition – stuck calipers cause dragging.

Replacement Tips

• Alignment: After any suspension work, get a four-wheel alignment. The GXP rear has adjustable camber on the trailing arms.
• Torque specs: Upper strut nut 18 ft-lb, lower strut bolt 74 ft-lb, sway bar link 55 ft-lb, trailing arm bolt 85 ft-lb.
• Spring compressor: SAFETY FIRST – use a proper strut spring compressor to remove the spring from the strut.
• Jacking: Support the frame, not the control arm, when removing springs.

Final Recommendation

For a 2007 Grand Prix GXP, focus on replacing worn struts with KYB Excel-G or Monroe OESpectrum, replace rear coil springs with Moog if sagging, and swap out any noisy control arms for Moog Problem Solver units. Use AC Delco hub assemblies for reliable wheel bearing life. Always replace sway bar end links and bushings to restore handling. If you are lowering, Eibach Pro-Kit springs paired with new struts provide a great balance of ride and performance. Prioritize safety – if any part shows significant rust or damage, replace it immediately. Stick with reputable brands like AC Delco, Moog, KYB, and Timken, and avoid cheapest no-name parts. Your Grand Prix GXP will reward you with tight, performance-oriented handling for another 100,000 miles.