Required on Dana 30 front axles if installing an aftermarket ring and pinion having a ratio of 3.72 or numerically higher.
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Dana 30 Empty Carrier

Fitment

Year	Make	Model
2000	Jeep	Wrangler
1999	Jeep	Wrangler
1997	Jeep	Wrangler
1998	Jeep	Wrangler
2001	Jeep	Wrangler
2002	Jeep	Wrangler
2003	Jeep	Wrangler
2004	Jeep	Wrangler
2005	Jeep	Wrangler
2006	Jeep	Wrangler