GM Full-Size Trucks 1970-1979 Repair Guide

Jacking Precautions


The following safety points cannot be overemphasized:

Always block the opposite wheel or wheels to keep the vehicle from rolling off the jack.
When raising the front of the vehicle, firmly apply the parking brake.
When the drive wheels are to remain on the ground, leave the vehicle in gear to help prevent it from rolling.
Always use jackstands to support the vehicle when you are working underneath. Place the stands beneath the vehicle's jacking brackets. Before climbing underneath, rock the vehicle a bit to make sure it is firmly supported.

To reduce the risk of personal injury, follow all jacking and stowage instructions. Use the jack only for lifting the vehicle during wheel change. Never get beneath the vehicle, start or run the engine while the vehicle is supported by the jack. Always secure and restow spare or flat tire and all jacking equipment.

  1. Park on a level surface and firmly set parking brake.
  3. Turn on hazard warning flasher. (If necessary).
  5. Set automatic transmission in PARK (manual transmission in REVERSE ).
  7. Block front and rear of tire at corner diagonally opposite to one being raised.
  9. Remove jacking tools from stowage area.
  11. Raise jack until lift head engages lower control arm (front location 2 wheel drive) or axle (front location 4-wheel drive/rear location 2 or 4-wheel drive).
  13. Raise vehicle by rotating jack handle clockwise.
  15. Make sure vehicle is supported properly, with jackstands, before starting any repairs.