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Home >> Chevrolet >> 1990 >> Step Van 7.4 N, Standard >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Driveshaft & Universal Joints >> Drive Shaft >> Drive Shaft Phasing Adjustments >> 2-Piece Or 3-Piece Shafts

2-Piece Or 3-Piece Shafts

  1. Rotate transmission until yoke ears are on a horizontal plane. If drive shaft is correctly installed, center line of yoke ears at each end of individual shafts will be parallel. If flanges are not in same plane, remove drive shaft. Install drive shaft with yokes aligned to a horizontal plane. See Fig 3.
    Fig 1: View of 5 Commonly Used Drive Shaft Combinations
    G28874
  2. On models with 2-piece shafts, rotate transmission yoke until trunnion is in horizontal plane. Install front drive shaft with "U" joint trunnion in vertical plane. Connect bearing support to crossmember.
  3. Ensure that front face of bearing support is perpendicular (90 degrees) to centerline of drive shaft. Install rear drive shaft with "U" joint trunnion of slip joint in vertical plane.
    Fig 2: Phase Alignment Of 1-Piece Drive Shaft
    G28877
  4. Set differential pinion yoke trunnion in vertical plane. Connect rear drive shaft to pinion yoke. If 2-piece shaft is correctly installed, centerline of trunnions at each end of individual shafts will be parallel. See Fig 3.
    Fig 3: Phase Alignment Of 2-Piece Drive Shaft (3-Piece Similar)
    G28880
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