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Old 06-24-2006, 12:37 PM   #1
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Changing fluid in manual transmission question

How often should this be done? Are there any tricks or tips you guys could offer to make it easier? Any insight will be appreciated.

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Old 06-24-2006, 09:45 PM   #2
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I hear tell that some people don't recommend ever changing the fluid on a high mileage tranny. Apparently, they think it will jack it up. I have no idea though. Just thought I'd throw that out since I have heard that alot. Could be a wives tale for all I know.

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Old 06-24-2006, 11:31 PM   #3
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I have heard that about auto trannies, but not sure about a manual. I will have to look that up in the owners manual. I know they recommend every 30k on an auto, along with the filter, but not sure about the manual.
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Old 06-25-2006, 07:46 AM   #4
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Not sure if or how often to change either, although I recently learned it is important to CHECK it and keep it full.

Why are you thinking of changing? Are you having trouble, noise?

To Check it, on the Passenger side of the tranny there is a Check/Fill plug, it is the highest one on the tranny, it looks hard to get at, but you can get a 15/16th socket on there and it comes right out. Stick your pinky way in there...you should feel fluid, if not, use a pump to add more.
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Old 06-25-2006, 10:17 AM   #5
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A few weeks ago my jeep started making this clanking noise when it is idling, I thought it was my exhaust rattling but my buddy said he thinks it's the transmission. I can't see where it would be leaking, I'll have to check the fluid level. My jeep has 181,000 miles on it and after he called that to my attention I figured it wouldn't hurt to change out the fluid.
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Old 06-25-2006, 04:41 PM   #6
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well i have a question. would it make it hard to shift or make your gears stick if the fluid was low?
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Old 06-25-2006, 07:02 PM   #7
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Quote:
Originally Posted by 94redwrangler
well i have a question. would it make it hard to shift or make your gears stick if the fluid was low?
Nope....at least not until something breaks. Mine was low and I did not realize until 5th gear started making a noise like a bag of marbles bouncing around under the hood....and even then it still shifted and pulled fine in 5th.....just noisy as hell. Drove it like that for 3 months.....didn't use 5th.

Low Clutch Fluid makes it hard to shift.

93_Wrangler... A "clanking noise when it is idling"... does not sound like Tranny problem to me......key word is "idling". Bang on your Muffler and Cat to see if either of those is making said noise.
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Old 06-25-2006, 09:22 PM   #8
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I think I've narrowed it down to the cat making the noise, the fluid level in the tranny was fine, so I believe it's time for a new cat.
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Old 07-02-2006, 07:24 PM   #9
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Chilton's says to change the manual fluid every 45k. I did it yesterday (Jeep had only 3k miles on it in 5 years, so everything is being maintenanced)...USE A PUMP, well worth the investment of $8. I made a huge mess in the driving until I got frustrated and went to Autozone.

It is also recommended to change the fluid in the transfer case at the same time (lot easier!)...same fluid in it.
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Old 07-02-2006, 09:12 PM   #10
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I know you're supposed to put ATF in the transfer case, but I'm not too sure about putting ATF in a manual trans, I'm almost positive you shpuld use 80w-90 in the trans
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Old 07-03-2006, 05:33 PM   #11
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According to Chiltons you put 80W-90 in both...we will see. I thought it was odd too, but so far no issues (75 miles on it since changing).
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Old 01-01-2007, 11:47 AM   #12
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Fluids

According to the factory service manual... ...it's 75w90 in the transmission (3.27qts. in the AX-15) every 18k mi, and ATF in the transfer case (3.25pts in the NP-231) every 30k mi.
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Old 10-05-2007, 07:22 PM   #13
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Quote:
Originally Posted by 94Renegade View Post
According to the factory service manual... ...it's 75w90 in the transmission (3.27qts. in the AX-15) every 18k mi, and ATF in the transfer case (3.25pts in the NP-231) every 30k mi.
I started to change the fluild in my 1997 wrangler maual trans. and found the fill plug would not come loose! After about 1.5 hrs., I gave up! This is after I finally stripped the torx type plug. I tried everything including a hammer and chisel! Need help! Are these plugs always this difficult. Any suggestion now would be greatly appreciate. Yes, I usally do all my maintenance! Help!
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Old 10-05-2007, 09:05 PM   #14
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Any time I work under a vehicle or an area that has not been touched in a while I use a penetraiting oil such as PB blaster or Kroil WD40 works pretty good too. I usually soak the the night before and a quick blast before working on them. It worked great on removing a snow plow mount from my jeep that had been installed since Nov 1989!
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Old 10-05-2007, 11:25 PM   #15
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The service manuals give the interval based on a "typical" on the road driver. That does not account for the use and abuse a driver gives a jeep in the typical off the road driving scenario. It also does not include driving in extremely hot or cold circumstances, through mud and water. And yes, running low on fluids in any of your cases will cause damage to the internal moving parts. The purpose of the lubricating fluid being there is to reduce friction and keep the parts cooler, and keep the parts LUBRICATED and less damaged.

The guideline is that you keep track of the use of your vehicle and the color of your fluids just like you check your oil and note it's appearance, smell and texture, and make your oil changes dependent on visual inspection. You need to open and regularly check the cases. A. you then know what shape your fluids are in, and B. you are able to get the plugs out since they didn't freeze up on you. Personally, I take mine to Jiffy Lube and let them crawl under it in the pit. Best $28 I ever spend!
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Old 10-06-2007, 12:01 AM   #16
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My 94 O&M Shows SAE 75W-90 in the man trans and Dextron II auto trans fluid in the transfer case.

Transfer case drain & fill @ 30k, 60k, 90k, and 120k
Man trans drain & fill at 37.5k, 75k,
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Old 10-06-2007, 09:06 AM   #17
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If you have a ax-15 you need to use a gl-3 or 4 oil not a 5. 5 is what all the auto parts stores carry. Get a oil like redline mt-90. If you use a 5 it will eat away at the syncros and will trash the tranny. For the t case it doesn't really matter. But I use a mobil 1 synthetic ATF in it.
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Old 10-06-2007, 02:03 PM   #18
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Quote:
Originally Posted by 4.0l sahara View Post
If you have a ax-15 you need to use a gl-3 or 4 oil not a 5. 5 is what all the auto parts stores carry. Get a oil like redline mt-90. If you use a 5 it will eat away at the syncros and will trash the tranny.
So the O&M is incorrect in stating, "Mopar Gear Lubricant or equivalent of SAE 75W-90 (API-GL5) quality." ?????

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