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Old 09-18-2009, 12:33 PM   #1
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Tranny question

Hey guys, new member here. Just bought a '99 Wrangler. It's a 4 cyl, 5-speed manual. Of course I want to change ALL of the fluids so I bought a Haynes manual. The manual covers '87 - '03 models and evidently 4 different manual trans. were used over those years. I didn't get an owner's manual with the jeep, so how can I tell which tranny I have?

Also, I've searched on here and found that there are some issues with worn synchros due to using GL-5 versus GL-3 gear oil in some of these transmissions. Someone in the other thread said that GL-3 was the original factory spec, but it is no longer available. My Haynes manual specifies GL-5 for the AX-4/5 and AX-15 transmissions. Anyone have further info about this?

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Old 09-18-2009, 12:59 PM   #2
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The Haynes manual (something I would never use) is using outdated information based on an error in early Jeep publications recommending GL-5 75W-90 gear lubes. While some synthetic 75W-90 GL-5 gear lubes are ok in the AX-5 and AX-15, most of the GL-5 stuff you find on the store shelves is not appropriate and will cause accelerated wear of the synchronizers. If the GL-5 bottle says something like 'safe for yellow metals' then it's ok for use. Products like Royal Purple's 75W-90 is fine, and Amsoil makes a GL-5 75W-90 that is ok for use too.

Or take the simple way out and buy Redline MT-90 from Summit Racing - High Performance Car and Truck Parts l 800-230-3030 (cheaper) or from Redline themselves at Red Line Synthetic Oil where it will be slightly more expensive. Redline MT-90 is a synthetic GL-4 75W-90 that has a great reputation for the AX-5 and AX-15 trannies.

And a big welcome to WF!

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Old 09-18-2009, 01:10 PM   #3
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Thanks Jerry. That's exactly the kind of info I'm looking for. Just so I am clear, you believe that I have an AX transmission that takes gear oil and not an NV1500/3550 which (according to Haynes) take MOPAR manual trans lube? I actually haven't looked at the tranny very close yet to see if it is stamped with some sort of ID, I just thought one of you experts would know off-hand what my jeep came with from the factory.
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Old 09-18-2009, 01:12 PM   #4
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You definitely have an AX-5 tranny behind your '99 2.5L engine. The AX-5 tranny used for the 2.5L engine didn't change until the 2.5L engine was changed to the current 2.4L.
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