Installation Procedure

Inspect the splines of the front propeller shaft stub shaft for a sufficient coating of grease. If the splines of the stub shaft does not have a sufficient coating of grease, lubricate the shaft with chassis grease (GM P/N 12377985 or equivalent).
Install the front propeller shaft to the transmission or the transfer case lining up the index splines.
Install the rear propeller shaft with the center bearing. Ensure the spline of both front and rear shaft mesh.
Install the rear propeller shaft to the rear axle pinion flange/yoke.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the yoke retainers and/or the bolts as necessary.
Tighten
- Tighten the yoke retainer bolts to 20 N.m (15 lb ft) (single universal joint type).
- Tighten the flange bolts to 45 N.m (33 lb ft) (double cardan joint type).
  
  Fig 1: Installing Bolts And/Or Yoke Retainers To Rear Axle Pinion Flange/Yoke - Two Piece
  Courtesy of GENERAL MOTORS CORP.
  
  Important: The center bearing must be aligned in order to prevent damage to the propeller shaft assembly. When bolting the center bearing in place, be sure to keep the center perpendicular (89-91 degrees) to the propeller shaft.
Install the bolts of the center bearing to the crossmember.
Tighten

Tighten the center bearing support bolts and nuts to 70 N.m (50 lb ft).
Lower the vehicle.

Fig 2: Installing Bolts Of Center Bearing To Crossmember - Two Piece
Courtesy of GENERAL MOTORS CORP.