Chrysler NSG370 transmission
From Dodge Wiki
The NSG370 does not use standard gear oil for lubrication. It uses a 10W30 or automatic transmission fluid weight manual transmission fluid. Common synthetic alternatives to the factory Mopar branded conventional lubricant are Royal Purple (lubricant manufacturer)'s Synchromax and Red Line Oil's MTL. The synthetic alternatives often improve shifting performance while decreasing internal wear and noise.
Only a fluid characterized by the MS-9224 specification should be used in order to avoid voiding the factory warranty.