Sorry MVG for the incorrect info:
I went to My Dodge: Dodge Owners Service Manuals - Dodge Cars, Minivans, SUVs
and downloaded a free copy of your Service Manual and found what you already now, not much help. Nitros with a manual transmission are a rare breed so not many here have one or know about the proper trans lube.
Selection of Lubricant
Use only manufacturer’s recommended manual transmission
fluid, refer to Fluids, Lubricants, and Genuine
Parts for correct fluid type.
Fluid Level Check
Check the fluid level by removing the fill plug. The fluid
level should be between the bottom of the fill hole and a
point not more than 3/16” (4.76 mm) below the bottom of
Add fluid, if necessary, to maintain the proper level.
Component Fluids, Lubricants and Genuine Parts.
Automatic Transmission Mopar_ ATF+4, Automatic Transmission Fluid.
Manual Transmission Mopar_ Manual Transmission Lubricant or equivalent (meeting the requirements
of DaimlerChrysler Material Standard MS-9224)
Transfer Case Mopar_ ATF+4, Automatic Transmission Fluid.
Front Axle SAE 80W-90 Multipurpose Type, GL-5 Gear Lubricant or equivalent.
Rear Axle SAE 75W-140 Synthetic Gear Lubricant or equivalent.
Brake Master Cylinder/Manual
Transmission Clutch System
Mopar_ DOT 3 Brake Fluid, SAE J1703 should be used. If DOT 3, SAE
J1703 brake fluid is not available, then DOT 4 is acceptable. Use only recommended
Power Steering Reservoir Mopar_ ATF+4, Automatic Transmission Fluid.