2005 Pontiac Grand Prix BaseFACTORY OEM SERVICE PROCEDURE

Trim Height Specifications

Trim Height Specifications

Tire Size Engine Package Style D (Curb) J (Curb) K (Curb) Z (Curb)
P225/60R16 3.8L GT 4-Door 255 mm (10.0 in) 213 mm (8.4 in) 213 mm (8.4 in) 35 mm (1.4 in)
P225/60R16 3.8L SC GTP 4-Door 256 mm (10.1 in) 213 mm (8.4 in) 213 mm (8.4 in) 36 mm (1.4 in)
F: P255/45R18
R: P225/50R18		 5.3L GXP 4-Door 254.9 mm (10.0 in) 228.8 mm (9.0 in) 221.6 mm (8.7 in) 28.5 mm (1.1 in)
* The D Height (represented as 1 on the figure) is measured from a point 30 mm outboard of the rear brake hose bracket bolt centerline to the bolt centerline of the trailing arm to the steering knuckle.
** The Z height is measured in line with the wheel center:
  • 1 represents the center of the rear bushing bolt
  • 2 represents the lowest inboard point on the ball
Fig 1: Measuring Z Height
GM186754Courtesy of GENERAL MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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