here's an excerpt from the RP site: Royal Purple Transmission Lubricant Chart
Transmission Lubricant Cross Reference Chart
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Automatic Transmissions:
Chrysler: ATF+, ATF+2, ATF+3, ATF+4 Max ATF
Manual Transmissions:
Daimler Chrylser Transaxles 1995 & newer, all models (MS9417 / PN04874465 & PN4773167) Synchromax
Daimler Chrylser Viper 1993 (DEXRON III) Synchromax
Daimler Chrylser Viper 1994 & newer (GL-4: 75W85, PN04874459) Max-Gear 75W90
Dodge Trucks Dakota / Durango, 1987 & newer (MS9224 / PN04874464) Synchromax
Dodge Trucks NV4500, 1994 & newer (GL-4: 75W85) Max-Gear 75W90
Dodge Trucks NV1500, NV3500 & NV5600, 1994 & newer (MS9224 / PN04874464) Synchromax
Jeep 1984 - 1987 T4 & T5 (Mopar PN04874464) Synchromax
Jeep 1984 - 1996, all others (n/a) Max-Gear 75W90
Jeep 1997 Cherokee (GL-3, 75W90) SAE 10W40 / XPR 10W40
Jeep all others Max-Gear 75W90
Jeep 1998 & newer, except NV3550 SAE 10W40 / XPR 10W40
Jeep NV3550 (Mopar PN04874464) Synchromax
Liberty & G-Force (n/a) Synchromax