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Jeep Wrangler YJ
YJ General Discussion
AX-15 Transmission Fluid Report
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<blockquote data-quote="Flyer58" data-source="post: 427370" data-attributes="member: 18629"><p>To show how little I know about oils I recently found out that Chrysler made a change long ago to the recommended oil for the AX-5 and AX-15 transmission. They say to use 10w30 motor oil instead of the 75w90 gear oil. So I looked into it and found the viscosity between the two is not on the same scale and those weights are actually close to being the same but one is on the gear oil scale and the other is on the motor oil scale.</p><p></p><p>I have read that ATF will work and in many cases last longer because it's designed for the higher temps of an automatic but never reaches that in a manual trans and still provides good lubrication. I would still change it on the same schedule as the regular fluid but it should last and do a good job. </p><p></p><p>My only question is will the gaskets and factory RTV sealant hold up. When I rebuilt my AX-5 and put new seals in the NP231 T-case I found that Permatex recommends a specific sealant for the ATF applications where the regular RYV will dissolve. The NP231 T-case uses ATF fluid as a lubricant.</p></blockquote><p></p>
[QUOTE="Flyer58, post: 427370, member: 18629"] To show how little I know about oils I recently found out that Chrysler made a change long ago to the recommended oil for the AX-5 and AX-15 transmission. They say to use 10w30 motor oil instead of the 75w90 gear oil. So I looked into it and found the viscosity between the two is not on the same scale and those weights are actually close to being the same but one is on the gear oil scale and the other is on the motor oil scale. I have read that ATF will work and in many cases last longer because it's designed for the higher temps of an automatic but never reaches that in a manual trans and still provides good lubrication. I would still change it on the same schedule as the regular fluid but it should last and do a good job. My only question is will the gaskets and factory RTV sealant hold up. When I rebuilt my AX-5 and put new seals in the NP231 T-case I found that Permatex recommends a specific sealant for the ATF applications where the regular RYV will dissolve. The NP231 T-case uses ATF fluid as a lubricant. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
AX-15 Transmission Fluid Report
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