6 New Grade 8 zinc plated free spinning washer nuts (Thread 3/8"-24) to attach the transfer case to the transmission compatible with many Jeep and Dodge Truck models including: Jeep Wrangler YJ 1987-1995, Jeep Wrangler TJ LJ 1997-2006, Jeep Wrangler JK JKU 2007-2018, Jeep Cherokee XJ 1984-2001, Jeep Grand Cherokee ZJ 1993-1998, Jeep Grand Cherokee WJ 1999-2004, Jeep Wagoneer and Grand Wagoneer 2022-2023, also Jeep models CJ, KJ, SJ, MJ. Compatible with Dodge Trucks from 1989-2023 including: W150 W250 Ramcharger 1989-1993, Ram 1500 1994-2023, Ram 2500 1994-2023, Ram 3500 1994-2023, Ram 4500 2008-2018, Ram 5500 2008-2018, Dakota 1997-2011, Durango 1998-2009. Compatible with the following transfer cases: NP231, NP241, NP208, NP242, all Atlas, NP247, NV241OR, NP205, NP241, NV271D, NV273D, Dana 300, NP241C, NP241DHD, NP241D, NP241DLD, NP241J, NP231J, NP231DHD. Replacement for Mopar J4006681 and 6033172. May fit other models and transfer cases as well. These are used on the transfer case to transmission mounting studs. Free spinning nuts are necessary to mount the transfer case because they work as a lock nut by creating tension when tightened, however, when removing them, as soon as the tension is broken they will unscrew like a regular nut without backing out the stud. Other types of lock nuts would back the stud out during removal and regular hex nuts would come loose during use. These are a high quality direct OEM replacement, better quality than the factory nuts. Note: These are intentionally tight fitting to withstand vibration in the drivetrain. Do not chase the threads to loosen the fit.