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Old 11-10-2013, 02:21 PM   #1
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Diff Transmission Service Advice

Howdy, I am new to WF and have been enjoying the extensive knowledge of all the posts from jeep owners. I am getting ready to change the diff oil in the front and rear as well as the transmission oil because I purchased my 99 Wrangler Sahara with 110k miles and like to be sure the quality of fluids.
My question is do I need to add “Limited Slip Additive” if the oil I select indicates limited slip (Valvoline Full Synthetic 75w-140).
I have selected Valvoline Synthetic 75w-90 for the transmission. The parts store only had two bottles of Royal Purple and the Valvoline was half the cost.
Advice or helpful direction appreciated.

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Old 11-10-2013, 03:46 PM   #2
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Personally, I wouldn't even consider paying Royal Purple's exorbitant prices, especially since its main difference is only that they have added a temporary purple dye to it for marketing purposes.

99.99% of the gear lubes already contain the friction modifier additive required if (!) you have the optional Tracloc limited slip differential in the rear axle. Whether you have Tracloc or not, pretty much any GL-5 gear lube on the shelf will be fine.

Valvoline's 75W-90 was a very good choice. The only time you need something with a heavier viscosity rating is if you tow a trailer or are doing hardcore competitive level wheeling.

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Old 11-11-2013, 05:50 AM   #3
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Thanks for the feedback!
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Old 11-11-2013, 09:12 AM   #4
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The gear lube will be a bit heavy for the transmission. I put redline mtl in mine and am very happy with it. It had gear lube in it from the previous owner and was difficult to shift on cold mornings.
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Old 11-11-2013, 09:18 AM   #5
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The gear lube will be a bit heavy for the transmission.
I forgot to include a transmission lube recommendation but a GL-4 75W-90 is what's recommended for the AX-15 as the OP has. One of the few sources for a GL-4 75W-90 is Redline MT-90.

Redline's MTL is a GL-4 70W-80 which is the spec/recocommended for the NV3550 and NGS370 used after the AX-15 was discontinued starting in 2000.

Both are full synthetics which help a transmission shift a little easier when it's really cold out.
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Old 11-11-2013, 09:33 AM   #6
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Is there a name plate on the transmission ans transfer case to know exactly what my rig has?
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Old 11-11-2013, 09:36 AM   #7
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Only the tcase has a plate on it, which so long as your TJ is not a Rubicon, your tcase is an NV231... aka just a 231.

Tell us what model year & engine type you have, and a brief description of the transmission... 5-speed or 6-speed, or automatic... and we can tell you what kind it is.
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Old 11-11-2013, 09:40 AM   #8
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99 Sahra 6cyl 5spd
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Old 11-11-2013, 09:40 AM   #9
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Your transmission is the AX-15 which was manufactured by Aisin in Japan.
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Old 11-11-2013, 09:56 AM   #10
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That doesn't sound good but I guess I don't have a choice at this point. I live in Ohio and going into our cool down season. I may change oil type to the thinner oil due to temps. Thanks for the help.
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Old 11-11-2013, 10:02 AM   #11
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What "thinner" lube are you talking about? Redline MT-90 is a synthetic GL-4 75W-90, what the factory calls for, which will be fine in Ohio's temps.
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Old 11-11-2013, 11:04 AM   #12
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I was thinking MTL but if MT-90 is synthetic both sound like a good choice.
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Old 11-11-2013, 12:29 PM   #13
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I think I am getting closer, The GL-4 75w-90 synthetic is for my trans. GL-5 75-140 for front and rear diff (Dana / D44) rear. Know that because of the dealer sticker came with the vehicle.

GL-5 gear oil should not not be used in transmissions from what I read. Correct?
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Old 11-11-2013, 03:22 PM   #14
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Right. Most GL-5 gear lubes are harmful to the gear synchronizers inside a transmission, only some synthetic GL -5 gear lubes are not. The synthetic GL5 gear lubes that are safe for use inside transmissions will say they are "safe for yellow metals" which means they won't harm the brass gear synchronizers like a standard GL -5 will.

Royal Purple Synchromax is one of the rare "safe for yellow metals" GL-5 gear lubes that is safe to use. By contrast, Amsoil's GL-5 is not safe for use in a transmission.
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Old 11-11-2013, 06:12 PM   #15
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Thanks really appreciate the help.
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Old 11-11-2013, 08:08 PM   #16
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Newbie here. I just changed the tranny fluid on my AX15. The manual calls for about 3.3 quarts and I wasn't able to get it all in...started to overflow from the fill hole. My guess is that I was able to get about 3.1 in there. Will I be OK?
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Old 11-11-2013, 08:21 PM   #17
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Newbie here. I just changed the tranny fluid on my AX15. The manual calls for about 3.3 quarts and I wasn't able to get it all in...started to overflow from the fill hole. My guess is that I was able to get about 3.1 in there. Will I be OK?
As long as you are on level ground, once it comes out the fill hole you are good.
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Old 11-13-2013, 01:34 PM   #18
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As long as you are on level ground, once it comes out the fill hole you are good.
Does the same go for the transfer case? It called for about 1.2 quarts. I put that much in and it didn't overflow...didn't add anymore as I was concerned about overfill.

Thanks for the assistance!
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Old 11-13-2013, 01:43 PM   #19
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Yes, same for the transfer case too.
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Old 11-13-2013, 03:15 PM   #20
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Just so people know not all posi's respond to the amount of friction modifier that comes in the gear oils that say they have it. I can safely say this since i worked in a trans shop for 9 years and still work as tech at the GMC dealer. You can try putting the gear oil in but if you experience any chattering put a sleeve of additive in there. We saw quite a few posi's chatter when serviced with good gear oil that claimed it had friction modifier, then we dumped a sleeve of posi additive in and it stopped. So we just put modifier in on top of the gear oil.
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Old 11-14-2013, 07:04 PM   #21
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Just so people know not all posi's respond to the amount of friction modifier that comes in the gear oils that say they have it. I can safely say this since i worked in a trans shop for 9 years and still work as tech at the GMC dealer. You can try putting the gear oil in but if you experience any chattering put a sleeve of additive in there. We saw quite a few posi's chatter when serviced with good gear oil that claimed it had friction modifier, then we dumped a sleeve of posi additive in and it stopped. So we just put modifier in on top of the gear oil.
Excuse the ignorance but what's a "posi"? Did I mention I'm a newbie? :-)

Thanks!
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Old 11-14-2013, 08:39 PM   #22
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Posi is short for the old GM Positrac which is a limited slip differential.

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