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  #1  
Old 06-18-2012, 11:58 AM
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Transmission Service

I would like to service or change the fluid in my 04 Overland. It has the 4.0 HO engine. Now with 128,000 miles and not knowing about the previous owners records, I think it's a good idea to do it. I already cahnged out the differential fluids and transfer case for the AWD system.

Changing the fluid is called service or overhaul in the service section of The Jeep Garage. Service requires less fluid than overhaul. I am not going to remove the trans, but would like to change as much fluid as I can. In other words, I would drain the torque convertor as well if it is easy to do. The torque convertor holds several quarts of fluid and only changing what drains out by removing the pan may mean I would be leaving almost half the old fluid in to mix with the new. So the more we drain out the better!

So, has anyone changed their fluid before and if so can you help me get a handle on draining the convertor if you did it and how many qts. of fluid will I need for this procedure? I think I'll stay with MoPar fluid, so I'll go to the "stealership" to buy my filter kit and fluid. But why buy more than you need! I'm not sure which Transmission I have, but with the 4.7 HO engine and the Overland, it should be easy to figure out by the VIN number or finding the number on the trans case.

If anyone has had problems doing this, I'd appreciate any heads up.

Thanks, Me Fix
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Old 06-18-2012, 02:15 PM
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Re: Transmission Service

The 4.7 comes with the 5-45RFE tranny. This tranny holds 13 Qts in total (torque converter/lines/pan). You will indeed not drain the fluid from the converter, so normally only change around 8 Qts. You can however get the fluid out of the converter. After you have done the fluid/filters in the pan (so with the tranny closed and ready), you remove the cooler upper line at the point where the metal line goes into a rubber part, not that far from the radiator. Put a hose over it and put it in a recipient. When you now start the engine, fluid from the converter will be pumped out. The fresh fluid however mixes inside the converter, so completely getting all old fluid out will take a lot of fresh fluid.
Also take care that you will get the flat filter for the 4x4, because the 4x2 has a little different filter. The round spinon filter is the same for both. It will be handy if you have the right size of filter tool, because the filter can be hard to remove sometimes.
There are special gaskets available for the tranny pan, but my experience is that the good old RTV is the best/ most leak free option.
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Old 06-18-2012, 04:03 PM
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Re: Transmission Service

Thanks Frank for getting back. I appreciate your knowledge and tips. I remember learning from a guy here at a transmission shop about how he would use a ball pin hammer to straighten the metal pan shape around the bolt holes before he would put the pan back on. It seems the bolts would pull up tight at the bolts which would pull or stretch the pan around all the bolt holes. If you put it back on that way, it would not seal good and would eventually leak. I know today many machanics use the RTV and no gasket at all. That is what I did after taking the covers off the differentials to clean out any slug inside the case. Also the magnets that were fiixed to the covers could not be inspected or cleaned if you didn't take the covers off. No gaskets, just the RTV sealer they sold me at the stealership.

It used to be that on the inspection cover at the fly wheel you could turn the wheel and converter till you saw a drain hole plug. you could remove it and drain the converter so as to get almost all the old fluid out. Maybe the Jeep doesn't have that drain plug or you cannot get to it, so pumping it out with the line off might work OK.

I think I'll try that.

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Old 06-18-2012, 04:41 PM
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Re: Transmission Service

Yeh, there are some torque converters who have a drain plug, which would be a perfect solution, but unfortunately on the jeep 5-45RFE converter there is not.
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Old 07-19-2012, 11:29 AM
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Re: Transmission Service

What is the best trans fluid to use? Do we have to use MOPAR fluid or can we go with Royal Pruple, or like a standard Dextron 4? I am looking to do the first trans service after 108K as she is doing some serious slamming at times when you lift of the throttle.

Anyone use new aluminum pans, and can I get away with a deep one eventhough the stupid exhaust crosses right in front? It doesn't look like I can, but I will check again.
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Old 07-19-2012, 04:45 PM
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Re: Transmission Service

royal purple works thats what i run in my wj with the 545rfe and you dont have to use any friction modifiers with royal purple.
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Old 07-20-2012, 01:45 PM
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Re: Transmission Service

Thanks for the info. I don't ever recall needing a friction modifier for trans fluid though. Gear Lube with limited slips, sure, but not trans. I am gonna look into the cost of this fluid this weekend, and see where I want to get the filters.
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Old 07-26-2012, 08:57 AM
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Re: Transmission Service

Not sure if you have done this already, but you would need a fluid that meets the Chrysler ATF+4 spec, Dexron is the GM spec. Royal purple definitely would work, along with amsoil or any off the shelf bottle that says ATF+4 on it.
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Old 07-26-2012, 10:41 AM
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Re: Transmission Service

No I didn't do the work yet. That is exactly what I wanted to know. I just looked at RP oil in the store!! Holy cow!! I definitely aint putting that in there! Great to know about the Amsoil and ATF +4.

I also need to change two filters, correct? Just gathering up the info I need. I am really considering an aluminum pan also but don't know if I want to spend the money.

Thanks again!!
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15.92 best e.t. w/ 2.29 short time :mad:

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Old 07-26-2012, 03:30 PM
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Re: Transmission Service

Yes, there are 2 filters. The main sump filter is flat shaped, and comes in 2 sizes, make sure you get the correct one for a 4x4 versus the 4x2. If you get the wrong one it will either be too long to put the pan back on or too short to suck up any fluid. When installing this filter make sure the gasket goes up in the pickup hole and then the filter gets pushed into it, if you try the other way it will not seal properly. The second filter (which is also inside the pan) is a small spin on filter like an oil filter, and comes in only one size.

I'm using amsoil ATF now, but before I have used Valvoline atf+4 with good results too. RP is good stuff but expensive.
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Old 08-13-2012, 08:20 AM
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Re: Transmission Service

Just finished servicing the transmission. I spent $121.77 at the "stealership" for both filters, a tube of sealer and seven Qts of fluid. After reading the transmission service procedure and going thru all the posted responses, I had no problems. I did use the full seven Qts of fluid. Maybe I allowed the transmission to drain longer than some as most say it takes six and a half Qts. to top it off. Transmission fluid Mopar ATF+4 was $7.14 a Qt.

The hardest part was containing the fluid when draining as there is no drain plug. After cracking and seal with several of the pan bolts loose, the fluid wants to leak out all over the place. I had a large pan which is larger in size than the transmission pan so it contained the spill quite nicely.

Thanks to all for the helpfull tips and suggestions.
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