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Home >> GMC >> 1990 >> Forward Control 6.2 J, Automatic, 400/M40 >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Suspension - Front (AWD & 4WD)) >> Inspection >> Ball Joint Checking >> Upper Ball Joint (Astro, Bravada, Jimmy, Safari, Sonoma, Syclone, Typhoon & "T" Series Blazer & Pickup)

Upper Ball Joint (Astro, Bravada, Jimmy, Safari, Sonoma, Syclone, Typhoon & "T" Series Blazer & Pickup)

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1992 Oldsmobile Bravada, 1992 GMC Yukon, 1992 GMC Suburban, 1992 GMC Sonoma, and 1992 GMC Safari. However, it is still accessible from the selected car via links, so may be relevant.
  1. Raise and support vehicle with jack stand under lower control arm, near lower ball joint. Ensure upper control arm bumper does not contact frame. Place dial indicator against lower part of wheel rim. Push in on bottom of tire while pulling outward at top. Read dial indicator, then reverse push/pull procedure.
  2. Lateral (horizontal) deflection should not exceed .125" (3.18 mm). If deflection is excessive, replace ball joint.
  3. Check ball joint, only with ball joint disconnected from steering knuckle, to see if ball joint can be rotated by finger pressure. Replace if ball joint can be twisted.
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