The factory rear track bar-to-axle bracket has a history of failure, even on JKs that see no off-roading.
Superlift's 4" JK lift includes a rear track bar relocation bracket plus a weld-on brace; this offers the strongest reinforcement.
This track bar bracket with an integrated bolt-on brace is an alternative for those not wanting to weld. Two U-bolts capture the axle tube to provide additional strength.