These specs are listed at the end of each section in the service manual, but most people just go by common sense. No other damage will be caused here by tightening the bolts to the incorrect value unless you make them so tight with air tools that they break or come loose.
50 ft / lbs is typical for bumper bolts. 60 ft / lbs is typical for shock absorber bolts for the large bolts that go through an eye with a rubber bushing and sleeve. 20 ft / lbs is typical for the small bolts when two are used to attach the strap, or flat rod that goes through the bushing. Those are often used on the bottom of the front shock absorbers and the top of the rear shock absorbers on GM trucks.
What is more important is to tighten any large bolts only when the truck is sitting on its tires. If you tighten them while the suspension is extended, they will squeeze the center sleeve in the bushing and hold it in a permanent twist when the truck is lowered to its normal ride height. As the truck is driven, the normal suspension travel will cause the bushings to twist further an they were designed for which will lead to rapid deterioration.
Saturday, March 27th, 2010 AT 3:02 PM