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Old 08-08-2010, 02:05 PM   #1
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tranny fluid

Hey I have a 5speed manual transmission and when i looked at the oil in side it was red, my questions are does the red color mean its synthetic and if it is can i use a regular 75w-90 gear oil to top it off or can i use a 75w-90 synthetic gear oil of a different color to top it off.

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Old 08-08-2010, 10:23 PM   #2
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Are you sure somebody didn't put ATF in there? If that's the case I'd change it out for 75w-90 like it says in the book. If it's Synthetic gear oil you shouldn't have any problem topping it off with either synthetic or regular as long as the grade is the same.

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Old 08-08-2010, 10:45 PM   #3
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check this out, make sure you check to see what type of tranny you have most likely the AX-4/5 or the AX-15

Jeep NV3550 Transmission & NP231 Transfer Case Service

DO NOT mix 7590 and ATF, bad joojoo if you're unsure follow the guide above and change your tranny out for 7590 i'm using royal purple its expensive though, if you're looking for a cheaper alternative you can use the mobil1 synthetic or i guess the valvoline. both are great
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