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Old 02-24-2011, 08:50 PM   #1
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Changed to Redline 75w90 and now...

So I changed the tranny fluid a few weeks ago in my 140k 99 4.0 5spd TJ and now it is progressively starting to grind more and more when shifting from 1st to 2nd. 4th is still stubborn at times but after driving it everyday this week, even when it's warm, I have to go from 1st to neutral before 2nd to lessen the gear clash. I have less than a thousand miles on this thing since I bought it. I guess my question is, what have you experienced with a high mileage tranny using 10w30 synthetic oil? So far I'm not thinking sycros, the old fluid was regular gear oil and it looked ok and it did grind 2nd when cold but was fine when warm. Thanks for your reply.

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Old 02-24-2011, 09:09 PM   #2
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Hey Phil, I keep forgetting to drop by the Cantina.

Now to your question. Did you use Redline MTL or MT 90? Your post said Redline 75w90, which is for differentials. Another member bought the 75w90 for his tranny and I went to the Redline site and it said that is only for diffs. If you used the MTL you should be o.k.

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Old 02-24-2011, 09:17 PM   #3
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PHIL: I have the same Jeep as you except I have less miles. When I installed my SYE I learned that I had water in the manual gearbox oil. I drained it, flushed it and refilled it with 75-90 as the book called for. Within 10 miles I noticed a bad case of synchro whine in 5th gear. Befuddled I actually considered adding water to the fluid. I went onto WF and searched and found a thread on this. Viola - Drain that 75-90 out and replace it with 10-30 synthetic motor oil. Something about GL-5 having something in it that is not compatible with brass synchros. Go with the synthetic motor oil and see if that doesnt help.
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Old 02-24-2011, 09:21 PM   #4
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Could you get away with using just regular 10w30 engine oil rather than synthetic?
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I live in philly and there is no way I'm leaving my top down and doors off anywhere around here! Maybe for small trips where I'm not moving far from my jeep I can't watch it with my eyes. Can't trust people no matter where you live! Unless you live in Canada lol
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Old 02-24-2011, 09:22 PM   #5
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Capn's right. Any synthetic 10/30 motor oil is good in the AX15. Just drain the Redline 75w90 straight into your diff so it doesn't go to waste And yes to above, it doesn't have to be synthetic.
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Old 02-24-2011, 09:26 PM   #6
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Thanks Pokey, were clearing out 10w30 at 2 bucks a litre at work wooo hooo!
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I live in philly and there is no way I'm leaving my top down and doors off anywhere around here! Maybe for small trips where I'm not moving far from my jeep I can't watch it with my eyes. Can't trust people no matter where you live! Unless you live in Canada lol
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Old 02-24-2011, 09:27 PM   #7
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I switched mine from gear oil to 10/30 M1 about 1000 miles ago and it has never shifted better hot or cold. Mines got 148000 on it now. Why not spend the $12 for a couple of quarts of the good stuff? It's not like you have change every 3000 miles or anything right?
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Old 02-24-2011, 09:30 PM   #8
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Could you get away with using just regular 10w30 engine oil rather than synthetic?
Well you can BUT:

How often do you change your manual gear oil? The average fellow probably NEVER does. The problem with dinosaur oil is that it eventually breaks down and loses it's lubricity. Synthetic does not break down as quickly. In your engine your probably change your oil between 3K and 5K. But you should change it every 6 mos if you dont drive it.

Synthetic ought to last forever in a tranny because it does not get fouled with byproducts of combustion like your engine oil does.
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Old 02-24-2011, 09:41 PM   #9
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So better off just to throw in the extra bucks from the get go and make it last
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Originally Posted by mannyssj13 View Post
I live in philly and there is no way I'm leaving my top down and doors off anywhere around here! Maybe for small trips where I'm not moving far from my jeep I can't watch it with my eyes. Can't trust people no matter where you live! Unless you live in Canada lol
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Old 02-24-2011, 09:44 PM   #10
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I just went out and found the last Redline bottle i used and it only read 75w90. No MT or MTL whatsoever. In fact it said it's not recommended for trannys because it's super slick. Not the exact words but you get the idea. Gonna have to quote some familiar friends who replied earlier! Thanks everyone! 10w30 it is.
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Old 02-24-2011, 09:45 PM   #11
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Just came across this, might be of help to someone!

Jeep NV3550 Transmission & NP231 Transfer Case Service
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Originally Posted by mannyssj13 View Post
I live in philly and there is no way I'm leaving my top down and doors off anywhere around here! Maybe for small trips where I'm not moving far from my jeep I can't watch it with my eyes. Can't trust people no matter where you live! Unless you live in Canada lol
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Old 02-24-2011, 09:47 PM   #12
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Quote:
Originally Posted by pokey View Post
Hey Phil, I keep forgetting to drop by the Cantina.

Now to your question. Did you use Redline MTL or MT 90? Your post said Redline 75w90, which is for differentials. Another member bought the 75w90 for his tranny and I went to the Redline site and it said that is only for diffs. If you used the MTL you should be o.k.
I'm still waiting to make a reservation to the new cafe! The Cantina has been pretty dry.
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Old 02-24-2011, 09:52 PM   #13
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Originally Posted by CapnDean View Post
PHIL: I have the same Jeep as you except I have less miles. When I installed my SYE I learned that I had water in the manual gearbox oil. I drained it, flushed it and refilled it with 75-90 as the book called for. Within 10 miles I noticed a bad case of synchro whine in 5th gear. Befuddled I actually considered adding water to the fluid. I went onto WF and searched and found a thread on this. Viola - Drain that 75-90 out and replace it with 10-30 synthetic motor oil. Something about GL-5 having something in it that is not compatible with brass synchros. Go with the synthetic motor oil and see if that doesnt help.
I'm convinced after all the comments, especially yours that I'm gonna try motor oil it. Thanks so much for sharing that!
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Old 02-24-2011, 09:56 PM   #14
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Capn's right. Any synthetic 10/30 motor oil is good in the AX15. Just drain the Redline 75w90 straight into your diff so it doesn't go to waste And yes to above, it doesn't have to be synthetic.
Heck fire! That's what I'm gonna do to! I'll get a pan to drain that liquid gold into and save it for my diffs! Keep your fingers crossed that my tranny likes the 10w30 cookies I'm about to feed it! LOL!
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Old 02-24-2011, 10:02 PM   #15
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[QUOTE=DevilDogDoc;1080558]I switched mine from gear oil to 10/30 M1 about 1000 miles ago and it has never shifted better hot or cold. Mines got 148000 on it now. Why not spend the $12 for a couple of quarts of the good stuff? It's not like you have change every 3000 miles or anything


Yeah for sure! Oh boy I hope mine has the same results! It would be nice to shift from 1st to 2nd again without grinding gears! Thanks so much.
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Old 02-24-2011, 10:03 PM   #16
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"""""The problem with dinosaur oil is that it eventually breaks down and loses it's lubricity."""""
A rumor promoted the the makers of plastic oil - synthetics.

Why doesn't it "break down" in diffs with 400,000 miles or more?
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Old 02-24-2011, 10:07 PM   #17
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Any particular brand better than the other? I've always used Castrol in my engine.
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Old 02-24-2011, 10:20 PM   #18
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Quote:
Originally Posted by DevilDogDoc
I switched mine from gear oil to 10/30 M1 about 1000 miles ago and it has never shifted better hot or cold. Mines got 148000 on it now. Why not spend the $12 for a couple of quarts of the good stuff? It's not like you have change every 3000 miles or anything right?
I didn't catch the M1 at first meaning Mobil One, I think I'll try that. Thanks! Oh and if my tranny explodes it's all you fault! Just kidd'n!
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Old 02-25-2011, 08:54 AM   #19
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Could you get away with using just regular 10w30 engine oil rather than synthetic?
Being as you live in Canada where it gets extremely cold, you really should go with the slightly more expensive synthetic 10W-30 as Aisin (the transmission manufacturer) recommends. Synthetics flow a lot easier in extremely cold weather which is crucial to the transmission, even more so than in the engine.
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Old 02-25-2011, 12:20 PM   #20
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I didn't catch the M1 at first meaning Mobil One, I think I'll try that. Thanks! Oh and if my tranny explodes it's all you fault! Just kidd'n!
i haven't put it in the tranny (yet-waiting for warmer weather) but definatly a fan of M1. Use it on the gear boxes on the slide out rooms on my travel trailer. before i used it they sounded/operated terrible-since using it they run as smooth/fast as new or better.
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Old 02-25-2011, 03:38 PM   #21
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Being as you live in Canada where it gets extremely cold, you really should go with the slightly more expensive synthetic 10W-30 as Aisin (the transmission manufacturer) recommends. Synthetics flow a lot easier in extremely cold weather which is crucial to the transmission, even more so than in the engine.
I was looking at work today, we have 0w30 AMS synthetic oil. Its says on the back its recommended as a replacement for 5w30 and 10w30. I'm thinking it might be a good, it says it has good cold flow and what not.

Heres all the info on it: https://www.amsoil.com/storefront/sso.aspx#driven
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I live in philly and there is no way I'm leaving my top down and doors off anywhere around here! Maybe for small trips where I'm not moving far from my jeep I can't watch it with my eyes. Can't trust people no matter where you live! Unless you live in Canada lol
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Old 02-27-2011, 04:41 PM   #22
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I wanted to update the thread for anyone who searches. I changed the tranny (AX15) fluid to Mobil 1 10w30 synthetic and problem solved! No more grinding from 1st to 2nd. Motor oil in a tranny sounded crazy at first but now I'm a believer.
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Old 02-27-2011, 05:06 PM   #23
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Just to clarify something guys so others don't get confused. Redline MT-90 GL4 is 75w90 but the MT stands for Manual Transmissions it also clearly states on the label NOT to use it in differentials. Differentials need a lubricant with a GL5 rating. BTW, I use MT-90 and have never had any of the problems described above, nothing but smooth shifting from my AX15 even in the coldest of temps.
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Old 02-27-2011, 05:43 PM   #24
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Just to clarify something guys so others don't get confused. Redline MT-90 GL4 is 75w90 but the MT stands for Manual Transmissions it also clearly states on the label NOT to use it in differentials. Differentials need a lubricant with a GL5 rating. BTW, I use MT-90 and have never had any of the problems described above, nothing but smooth shifting from my AX15 even in the coldest of temps.
Thanks for adding that. MT 90 is what I intended to buy in the first place because of the good things I heard about it. I ordered the 75w90 by mistake, that's what I get for doing "Jeep stuff" at work! Ha!
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Old 02-27-2011, 07:07 PM   #25
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MT-90 is essentially a 75W-90 that is also a GL-4. Redline's 75W-90 that is a special version of GL-5 does not have any additives in it that would make it harmful to the transmission so I can't figure out why it would have started grinding.
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Old 02-27-2011, 08:34 PM   #26
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Jerry, I took some pictures of the 75w90 as it looked new (I thought it was red until now!) and as it looked after only 300 miles. No big deal with the color but the pic doesn't show all the fine shavings, looks like gold dust in a way, I guess that's from the gears clashing, man I hate the smell of gear oil!! I also took pictures of the label and underlined the exact words about gear clash. The pics might not be great but you gotta love technology!
I was hoping at first that my mistake for not ordering MT90 would be ok as we have previously discussed, but the gear clashing got worse, I really noticed a difference right away after switching to 10w30 this weekend. I haven't driven it far, I'll take it to work everyday this week and see if it stays the same, I'm sure there will be no change.
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Old 02-27-2011, 08:46 PM   #27
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I'd have to guess that something was already failing, perhaps a bearing, before the gear lube swap.
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Old 02-27-2011, 10:00 PM   #28
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I should elaborate on my last post... The difference is that the trans shifts much better now with the Mobil 1. Everything feels normal now, easy shifting, no whine...I didn't have any whine with the Redline, just a crunch!
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Old 02-28-2011, 06:15 PM   #29
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Most of the synthetic GL-5 gear oils, like the Red Line, have limited slip additive in them now. That is the source of the gear clash. The LS additive affects the synchro operation.
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Old 02-28-2011, 06:26 PM   #30
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i have a 97 2.5L (think the AX5 right?) any suggestions for me as redline mt 75W90 is not available where i live. (keep in mind im in canada so it will see winter conditions)
i am running 80W90 dino oil and dont seem to be having any problems (about 3 months into it) any suggestions for me?

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