Autoacc Torsion Bar Key Adjustment Blocks for Chevy/GMC Trucks — Full-Thread Bolts, Set of 2 (Black, Grade 12.9)

Autoacc torsion bar key adjustment block nuts with full-thread bolts are a direct replacement pair that restore precise ride-height adjustment for compatible Chevy and GM trucks.

This pair of torsion bar key adjusters (two nuts and two full-thread M12 bolts) is engineered to replace worn or damaged factory components on many Chevrolet and GM light trucks and SUVs. Forged construction with a black anti-rust finish and high tensile grade 12.9 bolts delivers stronger, longer-lasting adjustment hardware than many OEM fasteners. Full threading on the bolts provides a broader adjustment range so you can fine-tune torsion bar preload for proper vehicle stance and suspension performance.

Which trucks and model years will these adjusters fit?

These torsion bar key adjusters fit a wide range of GM vehicles across multiple model years. Compatibility covers many Silverado, Sierra, Tahoe, Suburban and other GM platforms — check the list below against your VIN or service manual to confirm fitment.

• 1999–2010 Silverado and 1999–2010 Sierra (1500/2500/3500 families)
• 1992–2019 Suburban, 1995–2006 Tahoe, 2002–2006 Avalanche
• 1983–2004 S10, 1983–1991 S15, 2003–2014 Express/Savana
• Also fits Blazer, Jimmy, Yukon, Escalade, H2, Sonoma, K-series pickups and more (see full compatibility list)

How are these adjusters different from OEM parts?

Autoacc adjusters are forged for strength and use grade 12.9 bolts that are one grade stronger than many OEM fasteners, helping resist stretching and wear under load. The bolts are fully threaded for increased adjustment range and finished with a black anti-rust coating for improved corrosion resistance.

• Forged nuts and grade 12.9 bolts for enhanced durability
• Full-thread bolt design for finer height adjustment
• 22 mm hex head, M12 diameter, 2.85" length for direct replacement
• Black anti-rust coating helps prevent corrosion in harsh conditions

What should I know about installation and adjustment?

Installation replaces the existing torsion bar key and bolt assembly; basic suspension knowledge and standard hand tools are sufficient for an experienced DIYer. Use proper safety equipment and support the vehicle securely before working on torsion-bar systems, and adjust in small increments while measuring ride height.

• Requires suspension support and safe jacking procedures
• Adjust in small steps, checking ride height after each turn
• 22 mm socket fits the bolt head; bolts are 2.85" long to match OE geometry
• Sold as a set of two adjusters (two nuts and two bolts)

Will these parts prevent rusting or failure over time?

The black anti-rust coating improves corrosion resistance but does not make components impervious to environmental wear. Routine inspection and maintenance of the suspension will prolong service life; replace components showing excessive wear, rounded threads, or damage.

• Coating reduces oxidation but periodic inspection is still recommended
• Grade 12.9 bolts resist tensile failure better than lower-grade bolts
• Full threads reduce the need for aftermarket spacers or modifications
• Replace both sides when one side shows significant wear for balanced alignment

Who is this for: These Autoacc torsion bar key adjusters are intended for owners, mechanics, and restoration enthusiasts working on compatible Chevrolet and GM trucks who need stronger, corrosion-resistant replacement adjusters with a wider adjustment range. If you perform suspension repairs, maintenance, or ride-height tuning on Silverado, Sierra, Tahoe, Suburban and similar models, this set offers a direct-fit upgrade to restore dependable torsion-bar adjustment and extend service life.