MoparPartsGiant.com offers the wholesale prices for genuine 2018 Jeep Wrangler JK (Previous-generation) parts. Parts like Track Bar, Rear are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.6L. Transmission: 5-Speed Automatic Transmission, 6-Speed Manual Transmission.