What type of transmission fluid to use in a 1990 dodge truck 1500?

The type of transmission fluid for your 1990 Dodge Ram 1500 depends entirely on the transmission it has. Dodge used several different transmissions in their 1990 trucks. You must check your owner's manual or the sticker on the transmission itself to determine the correct fluid type.

Common transmissions in 1990 Dodge Ram 1500s included:

* 3-speed automatic (727 Torqueflite): This likely used ATF+3 or ATF+4 fluid. ATF+4 is generally backward compatible with ATF+3, but checking the manual is crucial.

* 4-speed automatic (A727 or 46RH): These also likely used ATF+3 or ATF+4. Again, consult your manual.

* 5-speed manual: Manual transmissions use gear oil, typically a GL-4 or GL-5 rated oil, but the *exact* specification will be in your owner's manual.

Do not guess. Using the incorrect transmission fluid can severely damage your transmission and lead to costly repairs. Look for information on the transmission itself (often a tag on the side) or in your owner's manual. If you can't find that information, a local auto parts store can help you identify your transmission based on the vehicle identification number (VIN).