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Unread 03-07-2014, 04:54 AM   #1
scbasspro
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Manual transmission fluid

91 YJ standard 5 speed manual transmission. Qustion: What transmssion fluid to use when changing?

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Unread 03-07-2014, 05:58 AM   #2
djwrangler
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Mobil 1 10w30 in my ax15
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Unread 03-07-2014, 06:17 AM   #3
mrdeath2000
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gallon jug of walmart 10w30 ~$11
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Unread 03-07-2014, 07:03 AM   #4
scbasspro
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fill plug location on manual transmission

Where is fill plug located on manual transmission
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Unread 03-07-2014, 07:11 AM   #5
mrdeath2000
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on the ax-5 (2.5L manual trans) it's on the passenger side just above the thing that sticks out with a couple wires coming out of it. Plug head size is same as the drain on the very bottom just in front of the skid plate.
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Unread 03-07-2014, 08:16 AM   #6
pat_v18
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I personally would not run motor oil in a transmission. I know guys do it but the reality is, is that motor oil belongs in a motor, gear oil belongs in things with gears. I run synchromesh in my transmission. I got it at a local auto parts store for $6 a quart. And for changing your gear lube, you don't wanna do it too often. The longer you have the lube in, the better.
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Unread 03-07-2014, 08:51 AM   #7
djwrangler
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10w30 motor oil is the recommended fluid for the transmission. Straight from Jeep.
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Unread 03-07-2014, 09:33 AM   #8
Old4X
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Quote:
Originally Posted by pat_v18 View Post
I personally would not run motor oil in a transmission. I know guys do it but the reality is, is that motor oil belongs in a motor, gear oil belongs in things with gears. I run synchromesh in my transmission. I got it at a local auto parts store for $6 a quart. And for changing your gear lube, you don't wanna do it too often. The longer you have the lube in, the better.
Run whatever you want in your Jeep, but the factory long ago switched from gear oil to plain 10W-30 MOTOR oil as the recommended lube.

You best be changing your gear lube often if you tend to drive through water like many off roaders do. Else you are running a bearing destroying milkshake in your gearbox.

And ATF is the recommended lube in our transfer cases .
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Unread 03-07-2014, 09:38 AM   #9
StanF
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Quote:
Originally Posted by mrdeath2000 View Post
gallon jug of walmart 10w30 ~$11
+1

I do exactly the same thing - no reason to go expensive
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Unread 03-07-2014, 10:02 AM   #10
rykemc
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I run Mobile 1 synthetic 5w30 in my ax15 and t-case. Per the instructions from my transmission man.
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Unread 03-07-2014, 11:04 AM   #11
Siva283
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Quote:
Originally Posted by Old4X View Post
Run whatever you want in your Jeep, but the factory long ago switched from gear oil to plain 10W-30 MOTOR oil as the recommended lube.

You best be changing your gear lube often if you tend to drive through water like many off roaders do. Else you are running a bearing destroying milkshake in your gearbox.

And ATF is the recommended lube in our transfer cases .
This x2. My trans oil gets changed more often than my motor oil. Only thing changing the oil to often will do is waste money. Oil breaks down over time it doesnt get better.
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Unread 03-07-2014, 05:49 PM   #12
mrdeath2000
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It's up to you. I run the cheapo wally stuff, this time I actually put in 15w40 cause I wanted the 40w which is closer to the 90w gear oil. I'm also in AZ so 100-120* summers.
If cabbage isn't a worry, then sure, spring for redline's GL3 stuff everyone talks about.

Consider your climate, how often are you having to change the fluids because of water contamination? If it's often, then you better go wally 10.30 so you can still pay for gas.
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Unread 03-07-2014, 05:50 PM   #13
bigbossd1030
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I ran syncromesh in my tranny once. Then smartened up and found mean max's thread about what he uses. I've used castrol edge since. I buy it when it goes on sale for 2 for one. Costs about 20 bucks for a 5 litre jug. I don't do much water where I live, so I swap the tranny fluid every second oil change. Probably not necessary to do it that often (10k km) but that tranny has a lot of clicks on it. 307k actually. So I try to be kind to her.
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Unread 03-07-2014, 06:29 PM   #14
YJWookiee13
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I used Redline MT90 right after i rebuilt my transmission last month, shifts beautifully!
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Unread 03-07-2014, 06:51 PM   #15
89YJBuilder
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I put what the Haynes manual says. Because they go with the transmission's manufacturer's specs. I also add 25% Lucas oil additive as I do in all my engines, transmissions, t-cases, and diffs. As Lucas recommends. Except for the Royal Purple I use in the wife Durango, I run it strait.
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