I don't know why. but at one time thats what getrag said to put in them.



Getrag 360 Specs
X Gus StephensGus Stephens has written about aviation, automotive and home technology for 15 years. His articles have appeared in major print outlets such as "Popular Mechanics" and "Invention & Technology." Along the way, Gus earned a Bachelor of Arts in communications. If it flies, drives or just sits on your desk and blinks, he's probably fixed it.
By Gus Stephens, eHow Contributor updated March 07, 2011


Print this articleThe Getrag G360 was a five-speed manual transmission for trucks. Manufactured in Germany, it was installed on 1989 to 1993 Dodge Ram 250 and 350 series trucks in the 3/4-ton and one-ton classes. Getrag 360s were designed for use behind the Cummins 5.9-liter turbocharged diesel engine.

Construction
Getrag's 360 was a heavyweight transmission with a cast iron case and an aluminum cover.

Gear Ratios
The stock gear ratios for the Getrag 360 were designed for heavy hauling and towing. For first gear through fifth gear respectively, the gear ratios are 5.53:1, 3.02:1, 1.60:1, 1.00:1 and 0.77:1.

Oil Specifications
Getrag recommended the use of 5W30 motor oil in the 360. Either a conventional or synthetic oil may be used. Oil capacity of the Getrag 360 is 3.5 quarts.

Substitutions
Getrag 360s suffered from notorious reliability issues commonly attributed to under-lubrication. In 1994, after just four years of production, Dodge replaced the Getrags in Ram trucks with the more durable New Venture NV4500. Retrofit kits to replace the OEM Getrag 360 with the NV4500 on 1989 to 1993 Dodge trucks are available



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you could do a fluid change and add some lucas trans fix to that auto it might help

Because synchromesh fluids did not exist or were in the early stages of development, not yet available to the general public, or tested and approved by the manufacturers.

Times change. You can stay stuck in 1990 and use motor oil, no problem. The Dodge manual for my '91 says ATF for cold weather. Or you can use synchromesh and have a better-shifting longer-lasting transmission. Your choice.