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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Mopar Manual Transmission Lubricant (PN 4761525) is the ONLY lubricant recommended for the NV3500.
Straight from the 2001 Dodge Ram service manual. But you can use the GM fluid that S-10s and Silverados use. The additives in the 80W-90 will etch the yellow metals in the transmission.