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Old 02-23-2012, 09:15 PM   #1
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Never change your transmission fluid?!?!

OK, so looking through the owners manual tonight it says:

Frequency of Fluid Change
Under normal operating conditions, the fluid installed at the factory will give satisfactory lubrication for the life of the vehicle. Fluid changes are not necessary unless the lubricant has become contaminated with water. If contaminated with water, the fluid should be changed immediately.

Life? Really Jeep?
Well, I think I'm going to change it anyways and add in Lucas trans-oil. Its been 8 years and I do not know the full history...
Anyone else catch this in the manual?

Its from the 2004 manual, page 247.

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Old 02-23-2012, 09:33 PM   #2
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Yeah I guess it's not good to change it in the 3speed auto idk about the manual trans. So I'm guessing you have the auto? I know someone else will chime in to correct me if I'm wrong.

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Old 02-23-2012, 09:38 PM   #3
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This was actually under the section for the manual. I have the 5 speed so that's why I was curious. I just see on here so often that people change all the fluids when apparently its not always needed...
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Old 02-23-2012, 09:40 PM   #4
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Hmm I guess it's bad for all of them lol!
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Old 02-23-2012, 09:49 PM   #5
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I wouldn't think it would be bad to change it, they just say its not necessary. I wouldn't have thought this would be the case, but as I think about it, there really isn't anything that I know of that would contaminate the oil or cause it to need changing (other than that what they said about water) Trannys are sealed, and its not like engine oil where its collecting a whole bunch of crap all the time. However going by that logic, you wouldn't think you were ever supposed to change the diff fluid either, but I'm pretty sure you are.
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Old 02-23-2012, 10:58 PM   #6
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Originally Posted by jstone326 View Post
I wouldn't think it would be bad to change it, they just say its not necessary. I wouldn't have thought this would be the case, but as I think about it, there really isn't anything that I know of that would contaminate the oil or cause it to need changing (other than that what they said about water) Trannys are sealed, and its not like engine oil where its collecting a whole bunch of crap all the time. However going by that logic, you wouldn't think you were ever supposed to change the diff fluid either, but I'm pretty sure you are.
yeah i wouldnt think it was bad but ive read/heard that it can clog something with gunk when you replace it or something like that but im no expert . just was doing some research about changing it because i thought about doing it and found out that it wasnt neccesary because things can go wrong and it can make it worse or break it. so ive heard
like i said not an expert
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Old 02-23-2012, 11:02 PM   #7
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I dropped my pan and changed the filter and it made my transmission 100% better. I would say go ahead and change it
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Old 02-23-2012, 11:05 PM   #8
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Originally Posted by 98SaharaTJ View Post
I dropped my pan and changed the filter and it made my transmission 100% better. I would say go ahead and change it
does dropping the pan remove all the fluid from the trans? because my 32rh holds like 17.1 quarts
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Old 02-24-2012, 01:46 AM   #9
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Dropping the pan will drain about 5 quarts,
32rh, empty, should hold 17.1 pints, not quarts, IMO
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Old 02-24-2012, 06:09 AM   #10
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The fluid for life usually means something like 60k miles.
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Old 02-24-2012, 07:43 AM   #11
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So it does mention that the diff fluid should be changed. It even shows you how. I guess that crud can get in there through the axles...right? I am probably COMPLETELY wrong on that thought process...

I am stickingto the thought that the trans fluid will be changed. I just thought it was interesting.
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Old 02-24-2012, 09:24 AM   #12
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Quote:
Originally Posted by fourty4magjr View Post
does dropping the pan remove all the fluid from the trans? because my 32rh holds like 17.1 quarts
As said above, dropping the pan only drains around 4 maybe 5 quarts out of the 8+ quarts of ATF+4 it holds. The rest of the ATF that doesn't get drained out by dropping the pan is inside the tranny cooler in the radiator, coolant lines, and torque converter. The only way to change all of the ATF+4 is to flush it out with the engine running and transmission in Neutral so it can pump the fluid through the system.
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Old 02-24-2012, 09:31 AM   #13
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At 33,000, the oil in my diffs was black, transfer case was brown, and trans was still pink. Changed it all.........
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Old 02-24-2012, 09:55 AM   #14
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It is very possible to get crud into the autos depending on where you live/wheel. The auto has a small vent hole on the top side and it is possible for small contaminants to get in through there. The same thing with the differentials; if that vent tube becomes disconnected from the diff, you can get crud in there. I became quite familiar with all of this when I was in Alaska. Glacial silt likes to find a home inside transmissions and differentials. That was with my '97 TJ.
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Old 02-24-2012, 10:02 AM   #15
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It is very possible to get crud into the autos depending on where you live/wheel. The auto has a small vent hole on the top side and it is possible for small contaminants to get in through there. The same thing with the differentials; if that vent tube becomes disconnected from the diff, you can get crud in there. I became quite familiar with all of this when I was in Alaska. Glacial silt likes to find a home inside transmissions and differentials. That was with my '97 TJ.
2003 and newer automatics had that problem resolved since its top-mounted vent hole has a rubber vent tube attached to it that keeps water out. On 2002 and older automatic transmissions, the vent hole is actually on the front of the transmission, just above the input shaft and behind the torque converter. That vent hole's location problem is a little harder to cure since the front vent hole has to be welded up and a new vent hole drilled and tapped into the top of the transmission so a hose barb can be threaded into the transmission and a vent hose attached to it.
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Old 02-24-2012, 10:04 AM   #16
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Quote:
Originally Posted by Jerry Bransford View Post
2003 and newer automatics had that problem resolved since its top-mounted vent hole has a rubber vent tube attached to it that keeps water out. On 2002 and older automatic transmissions, the vent hole is actually on the front of the transmission, just above the input shaft and behind the torque converter. That vent hole's location problem is a little harder to cure since the front vent hole has to be welded up and a new vent hole drilled and tapped into the top of the transmission so a hose barb can be threaded into the transmission and a vent hose attached to it.
Yep, another mod I discovered the hard way.
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Old 02-24-2012, 10:14 AM   #17
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I actually flush mine at least once or twice a year. For some reason the ponds, and mud runs, and all the in between all of the other abuse I give it has suffered from the transmission still shifts fine and never slips. Even when the tach never reads less than 3000 and I'm rocking it from drive to reverse when I get stick and decided to rock my way out.
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Old 02-24-2012, 11:17 AM   #18
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Originally Posted by 50Johnbob View Post
Dropping the pan will drain about 5 quarts,
32rh, empty, should hold 17.1 pints, not quarts, IMO
LOL! whoops was way to late when I posted that I ment pints
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Old 02-24-2012, 11:19 AM   #19
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Originally Posted by crazyredneck View Post
I actually flush mine at least once or twice a year. For some reason the ponds, and mud runs, and all the in between all of the other abuse I give it has suffered from the transmission still shifts fine and never slips. Even when the tach never reads less than 3000 and I'm rocking it from drive to reverse when I get stick and decided to rock my way out.
Ok so when you flush yours do you actually empty the trans or just drop the pan?
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Old 02-24-2012, 12:41 PM   #20
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For the sake of thoroughlness I did both.
Here's my write-up on flushing and replacing filter on my auto trans.

http://www.wranglerforum.com/f5/tran...er-120379.html
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Old 02-24-2012, 01:16 PM   #21
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Quote:
Originally Posted by fourty4magjr

Ok so when you flush yours do you actually empty the trans or just drop the pan?
I know this wasnt directed towards me but when I did mine all I did was drop the pan and change the filter. I didn't attempt the flush because I was somewhat scared of running the tranny dry. Also some people would say a flush is bad because it dislodges any crud that has settled and it is now floating through your system. I can't verify that last part myself seeing as how I've never attempted it.

I will say that changing the filter and adding what new oil I did made a huge difference.
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Old 02-24-2012, 01:52 PM   #22
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Originally Posted by jetskier111 View Post
Fluid changes are not necessary unless the lubricant has become contaminated with water. If contaminated with water, the fluid should be changed immediately.
I read this and think of all the water crossings and mud we drive through. Definitely need to change the fluid at one point or another.
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Old 02-24-2012, 02:00 PM   #23
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Originally Posted by 98SaharaTJ View Post
I know this wasnt directed towards me but when I did mine all I did was drop the pan and change the filter. I didn't attempt the flush because I was somewhat scared of running the tranny dry. Also some people would say a flush is bad because it dislodges any crud that has settled and it is now floating through your system. I can't verify that last part myself seeing as how I've never attempted it.

I will say that changing the filter and adding what new oil I did made a huge difference.
Ok awesome then I am going to be doing that soon. That's where I got the idea it was bad for the tranny.
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Old 02-24-2012, 02:14 PM   #24
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Flushing old ATF out of an automatic transmission is not bad for it. Period.

That flushing old bad ATF out and replacing it with fresh ATF is bad for the transmission is nothing more than an old wive's tale. If the transmission was abused, in bad shape, and had problems in it where it was ready to come apart internally anyway, then perhaps flushing might be the final nail in the coffin. But you can't blame pre-existing problems where the transmission was in bad shape to begin with and close to failure anyway on finally getting around to a long-overdue ATF change.

For a typical automatic transmission, I'd flush it without a second thought or moment's hesitation. If flushing it caused a problem, I figure that saved me from it failing on me next month at night 75 miles from home.
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Old 02-24-2012, 04:36 PM   #25
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Originally Posted by Jerry Bransford View Post
Flushing old ATF out of an automatic transmission is not bad for it. Period.

That flushing old bad ATF out and replacing it with fresh ATF is bad for the transmission is nothing more than an old wive's tale. If the transmission was abused, in bad shape, and had problems in it where it was ready to come apart internally anyway, then perhaps flushing might be the final nail in the coffin. But you can't blame pre-existing problems where the transmission was in bad shape to begin with and close to failure anyway on finally getting around to a long-overdue ATF change.

For a typical automatic transmission, I'd flush it without a second thought or moment's hesitation. If flushing it caused a problem, I figure that saved me from it failing on me next month at night 75 miles from home.
Thanks for clearing that up for us Jerry! I might end up doing that then!
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Old 04-21-2013, 09:25 AM   #26
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It is so easy and good to change all hydraulic and lubricating fluids in a Jeep, there is just no good reason not to do it regularly. Fluids will break down due to heat and become contaminated with parts wear debris. Even if you never go mudding or cross water.

Purchasing differential gear oil, transmission fluids, etc. is much cheaper than replacing major componenets.

Most of the Jeep owners that participate in this forun would be considered "enthusiasts", not just owners. Although we don't want to waste our money, I don't want to be penny wise and pound foolish.

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