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Technical & Advanced


Vehicle Appearance, Care, & Maintenance

Help for the do-it-yourself vehicle owner. Suggestions on how to make your truck look better & last longer.

  • 4,392 topics
  • 33,499 replies
Mobil 1 annual oil - last post by KARNUT

Ask the GM Technician

Have a hard question?
Only Questions That You Would Go To The Dealer For, Please!

  • 13,854 topics
  • 57,441 replies
2004 Sierra Tranny Compatib... - last post by Chris

Performance Engine Tuning

A forum dedicated to intensive and experienced engine and computer modification topics.
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  • 1,308 topics
  • 11,191 replies
Tuners - last post by SouthCo

Transmission, Suspension, Transfer Case, & Axles

For all transmission and drive-line related topics. Included but not limited to 2WD, 4WD, AWD, transfer cases, & lift/lowering kits.

  • 5,039 topics
  • 35,332 replies
Level kit questions - last post by dasimmon

Wheels, Tires, & TPMS

Anything related to rims, tires, tire pressure monitor sensors, fixing a flat, and general tire maintenance here.

  • 3,253 topics
  • 23,559 replies
Bigger Tires on Rally Editi... - last post by GM_2015gorash

Audio, Electronics, OnStar, MyLink, Intellilink & SiriusXM

Infotainment, Mylink, Intellilink, SiriusXM, Bluetooth, Navigation Systems, OnStar, RemoteLink, smartphone connectivity, & aftermarket audio. Also includes Android Auto and Apple CarPlay.

  • 5,610 topics
  • 28,698 replies
BCM wire harness 2000 GMC D... - last post by Skweez


Installations, Maintenance, and Repairs.

  • 479 topics
  • 3,242 replies
How-To: GMT900 Tow Mirror I... - last post by Formulabruce