The torque, shown on page 3C1-19 of the 1984 Buick Chassis Service Manual of 85 N.m (63 ft. lbs.) for subject bolts should read 55 N.m (40 ft. lbs.)
Please make note of this change in your copy of the Service Manual.
General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.