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Old 02-06-2009, 06:50 PM   #1
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Changin tranny gear oil

Well first of all wanted to say i've had trouble shifting recently with my jeep and couldn't figure out why...? Went to change the oil in it today took of my fill plug and had oil comin out of the fill hole...? which really surprised me. Anways i went to take of my drain plug and had nothing come out then i happen to notice i had ice inside my tranny WHAT THE HELL...! Has anyone ever had this happen haha. I think i may of figured out why my tranny gets froze up when its cold out. Got a heater out and warmed up the garage and it came out fine. But how in the world did my tranny get ice in it anyone have any ideas or clue how it got in there ?

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Old 02-06-2009, 06:58 PM   #2
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Have you played in any water crossings?

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Old 02-06-2009, 07:01 PM   #3
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The only way water can get inside your Aisin transmission is via the vent on top... so it sounds like someone took your Jeep through some deep water at some point. I'd quickly drain and refill it with Redline MT-90 which is one of the few suitable gear lubes that meets the specs of your transmission. You shouldn't use the run-of-the-mill GL-5 75W-90 like you find in the local auto parts stores. If your manual says to use a GL-5 75W-90, that's a typo. Only GL-3 or GL-4 should be used... Redline's MT-90 is a fully synthetic GL-4 75W-90.
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Old 02-06-2009, 07:07 PM   #4
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Well at least i know now i've had my jeep for 8 or so months now ran fine until it started gettin cold out. I know i haven't had it in anywater except for on the street and it wasn't deep enough anyway not even 6 inches of water so i'm guessin previous owner was then i always wondered why the carpet in it was nasty as hell and stunk when i bought it. But yeah i'll go with the Redline then i went and bout RP synchromax at but i guess i can run that through first drive it a while then put redline in or will RP be alright ? I was told to drive a hundred or so miles then drain again and then refill again.
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Old 02-06-2009, 07:17 PM   #5
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Don't run RP Synchromax in your Aisin transmission, it doesn't meet the specs. Royal Purple's Synchromax is appropriate (and is actually very good) for the newer NV3550 but not your Aisin transmission. No need to drain & refill after 100 miles.
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Old 02-06-2009, 11:57 PM   #6
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So just stick with redline then ?
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Old 02-07-2009, 12:03 AM   #7
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Quote:
Originally Posted by RED98TJ View Post
So just stick with redline then ?
Yep. MT-90 or MTL

Sychromax "RP" or synchromesh is not suited for the AX=15. And can possibly eat your "paper like" synchronizers. But is great for the NV3550 .
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Old 02-07-2009, 12:07 AM   #8
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Gotcha how much can i get that redline for ? and you can't get it at any local auto store or do you have to order it ?
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Old 02-07-2009, 12:12 AM   #9
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That depends on where you live and what type of auto stores you have near you. Most any race shop can get it and I "think" orielly can get it.

If you want to order it online here..... Red Line Synthetic Oil 50304 - Red Line MT-90 Transmission Gear Oil - summitracing.com

Summit can usually get it to you in a couple days.
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Old 02-07-2009, 02:57 AM   #10
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"You shouldn't use the run-of-the-mill GL-5 75W-90 like you find in the local auto parts stores. If your manual says to use a GL-5 75W-90, that's a typo. Only GL-3 or GL-4 should be used... Redline's MT-90 is a fully synthetic GL-4 75W-90.


So, would a quick lube place know this or should I remember to specify the Redline's MT-90?

Thank you
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Old 02-07-2009, 08:45 AM   #11
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Or you could stop by a Jeep dealership and purchase the correct fluid that came in it. jmho
It's always an option.

C.
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Old 02-07-2009, 10:53 AM   #12
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Quote:
Originally Posted by cork1958 View Post
So, would a quick lube place know this or should I remember to specify the Redline's MT-90?

Thank you
I doubt there's a quick lube in the world that would even care let alone know about why a GL-5 gear lube isn't a good choice for a manual transmission. Just write down Redline MT-90 in your owners manual. That's not the only suitable lube but it's about the best and you can't just rely on the dealership to know since not even all Jeep dealers know/care about the GL-5 long-term effects issue.
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Old 02-07-2009, 01:10 PM   #13
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I have redline mtl in mine..got it at summitracing.com for 9.99 qt-4 qts
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Old 02-08-2009, 02:16 AM   #14
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Quote:
Originally Posted by Jerry Bransford View Post
I doubt there's a quick lube in the world that would even care let alone know about why a GL-5 gear lube isn't a good choice for a manual transmission. Just write down Redline MT-90 in your owners manual. That's not the only suitable lube but it's about the best and you can't just rely on the dealership to know since not even all Jeep dealers know/care about the GL-5 long-term effects issue.
You say that as if you don't recommend any other type lube in ANY manual transmission. I also have a manual Ford Ranger. Is that what weight tranny lube you'd recommend in that also? I've had it for 13 years now. Never used anything other than what the local quick lube uses.

Thanks

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