1990-2004 GMC Sonoma Muffler Torque Specs

4.3L V6 Vortec

Applies to 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, and 2004 GMC Sonoma

Labor Time:1 hours

🔧 Torque Values6 specifications

Component	lb-ft	Nm	Notes
⚠️ Clamp Bolts	40	54	—
⚠️ Flange Bolts	30	41	Apply anti-seize
Hanger Bolts	15	20	—
Heat Shield Bolts	12	16	—
⚠️ Manifold Nuts	29	39	Apply anti-seize
⚠️ O2 Sensor	40	54	Apply anti-seize to threads

⚠️ = Critical torque value | Always verify with vehicle-specific service manual

⚠️ Some critical specs are estimated. Please verify sequence.

1990-1997 4.6L V8 Modular

2007-2012 3.7L I5

2011-2016 6.7L V8 Power Stroke Diesel

1992-1995 1.5L I4 D15

2016-2023 2.0L Turbo I4

1995-1999 2.0L Turbo I4

The primary torque specification for muffler on a 1990-2004 GMC Sonoma is 54 Nm (40 lb-ft).

There are 6 torque specifications for muffler on the 1990-2004 GMC Sonoma 4.3L V6 Vortec, covering all related fasteners and components.