Crown J4006547 3/8-16 Exhaust Manifold-to-Downpipe Stud

This thread-in stud fastens the exhaust manifold to the downpipe on specific Jeeps with the 4.2L inline-six. Crown identifies J4006547 as a 3/8-16 manifold-to-downpipe stud. It is not the press-in stud used on some 2.5L and 4.0L exhaust systems.

Confirmed applications

• Wrangler YJ, 1987–1990, 4.2L engine
• CJ-5, 1981–1983; CJ-7 and CJ-8, 1981–1986, with 4.2L engine
• SJ / J-Series, 1981–1986, with 4.2L engine

Sold as an individual replacement stud. Verify the original exhaust connection and thread-in design before ordering; do not substitute the J4007109 press-in stud based on model year alone.