1989 S10 Blazer loose lugnuts after tire change

I suppose it is possible to stretch the wheel lugs beyond their capability, even with an air wrench it seems unlikely that is your issue.

I recommend that you do the following:

1. With the wheel off the ground, remove all the lug nuts and the wheel and inspect the lugs for visible damage. Things like missing or distorted threads or changes in diameter due to stretching. If they look OK, then continue. If not, then replace the lugs. On some vehicles they can be tapped out with a hammer but on others you need to replace the hub as well.

2. Replace the wheel taking care to make sure there is no foreign matter on either the hub surface or the mating surface on the wheel.

3. Replace the lug nuts and tighten them "lightly" to ensure that the wheel is in solid contact with the hub.

4. Lower the wheel to the ground and then torque the nuts to the proper specification using the "5 bolt" pattern as shown in this article:

Lug nut torque pattern

Image:

5. Repeat the process on the other wheels. Take the car for a test drive and then re-torque all the nuts after the drive. They should be close to the specified torque. If not, then your lugs and/or nuts are damaged and should be replaced.