I am changing the fluid in my NV4500, I got the fluid from the dealer parts department, that is labeled for the NV-4500, but the part number on the bottle is 04874459, on the PTO cover on the transmission it says 4637579.

I am not to worried since the bottles say it is the unique fornula for the NV-4500, but I wanted to check with the ghuys I trust since the part numbers are different.

 

Part numbers change over the life of a product, especially with fluids. I am particular to Red Line's synthetics, but the OEM stuff from Dodge is perfectly acceptable.