Bushing Replacement (R-P20/2500-30/3500 & G30/3500)
- Raise and support vehicle under frame with control arms hanging free. Remove wheel and tire assembly. Disconnect shock absorber and stabilizer bar bracket at lower control arm.
- Place floor jack under lower control arm. Jack must be positioned inward of coil spring and in depression areas of control arm. Install safety chain over upper control arm on inside of stabilizer bar and on outside of shock absorber.
- Remove lower control arm "U" bolt nuts and washers. Lower control arm. Remove grease fittings. Remove bushing nuts and lower control arm shaft from control arm. Remove seals located between bushing and lower control arm shaft.
- To install, slide new seal onto each end of upper control arm shaft. Install shaft into upper control arm. Adjust shaft until centered in control arm, then tighten bushing nuts to specification. See Fig 1. Check shaft for free rotation. Install grease fittings and lubricate bushings.
- Install lower control arm. Ensure front indexing hole in lower control arm shaft aligns with crossmember attaching stud. Tighten all fasteners to specification. See appropriate TORQUE SPECIFICATIONS table at the end of this article. Check wheel alignment. See ALIGNMENT SPECIFICATIONS article.
Courtesy of GENERAL MOTORS CORP.