Rear trailing arm bushing replacement on a Saab 9-5. A set of polyurethane bushings is being installed to replace the worn out old rubber pieces and improve cornering stability.

Saab sells replacement bushings with aluminium sleeves and supplies a set of tools to get them in and out. We're installing aftermarket polyurethane inserts, which are much easier to get in, but the old bushing still needs to be pressed out of the arm. With no Saab tools handy, we will be using the trusty hacksaw and gear puller combo.

Tools:

  • 21 mm socket: lower shock bolt (optional);
  • 18 mm socket: bushing housing bolts;
  • 17 mm socket: wheel bolts;
  • 16 mm socket: anti-roll bar link bolts;
  • 10 mm socket: brake line and cable bracket bolts;
  • torque wrench;
  • car jack and axle stands;
  • breaker bar;
  • gear puller;
  • hacksaw;
  • hammer and rubber mallet.
30.09.2007
Jack stands

Raise the car and secure it on jack stands. Take the wheels off. Both wheels need to be in the air so the suspension is level.
30.09.2007
Link

Detach the anti-roll bar link from the trailing arm.
30.09.2007
Bracket

Unscrew the bracket supporting the brake line and handbrake cable. There should be no tension in the handbrake, so don't forget to release it when you raise the car.
30.09.2007
Shock

The Saab Workshop Manual does not mention unbolting the shock, but I found that it allows for more freedom to move the arm around. Use a big breaker bar to loosen this bolt.
30.09.2007
Jack

Support the trailing arm with a jack so it won't strain the brake line when you unbolt it from the car.
30.09.2007
Housing

Undo three 18 mm bolts holding the bushing housing to the car. Carefully lower the jack, support the brake line separately.
30.09.2007
Clamp

Before taking on the bolt that goes through the bushing, clamp the housing to the trailing arm. This will make it easier to loosen the nut.
30.09.2007
Bush

Pull the bolt out and slide the housing off the bushing. The housing is tied to the handbrake cable, just let it hang off it.
30.09.2007
Gear puller

Push the rubber part of the bushing out using a gear puller or another suitable tool.
30.09.2007
Hacksaw

Assemble the hacksaw with a blade inside the bushing and cut through the soft aluminium sleeve.
30.09.2007
Sleeve

Chisel the sleeve out and discard the old bushing. Clean the inside of the hole and all the contact surfaces.
30.09.2007
New bushings

New polyurethane bushing from Powerflex. Comes with a stainless inner sleeve and a bag of grease.
30.09.2007
Fitted

Lubricate the bushing, slide in the polyurethane halves first, then the inner sleeve.
30.09.2007
Housing

Fit the housing, clamp it to the arm and tighten the nut to 70 ft-lbs +60°.
30.09.2007
Lifted

Lift the trailing arm using a jack until the bushing enters its socket on the underside on the car.
30.09.2007
Bolted on

Position the housing as close to the original location as possible and tighten the bolts to 66 ft-lbs +30°.
30.09.2007
Bracket

Re-attach the brake line bracket. These thin M6 screws broke off on both sides when I took them out, so I had to re-drill and tap the holes again. Put the screws on anti-seize.
30.09.2007
Link

Tighten the anti-roll bar link bolt to 40 ft-lbs. Re-fit the lower shock bolt if you unbolted it (140 ft-lbs). Tighten the wheels to 81 ft-lbs and lower the car to the ground.

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