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  #1  
Old 08-12-2015, 11:05 AM
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ATP tranny filters any good?

Hello I'm new here. I just picked up an 04 GC overland. It threw a P0987 but shifts great no clunky etc. I notice the fluid is dirty and was planning on doing filter fluid anyway. I'm on a tight budget now and the best price I see is on ATP filter kit. Is this the way to go or wait for a couple weeks and go for OEM filters.
Thanks

Canaan

---------- Post added at 03:05 PM ---------- Previous post was at 03:04 PM ----------

BTW the code cleared on its own 2 days later.

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  #2  
Old 08-12-2015, 11:51 PM
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Re: ATP tranny filters any good?

Welcome to the garage.
The P0987 code means that an automatic test for the 4C clutch pressure switch failed twice. Every time a forward gear is selected and the rpm goes over 1000, the TCM will test the pressure switches. Dirty fluid can influence the pressure switches. How dirty is dirty? When you are going to drop the pan only, the fluid trapped in the torque converter and lines will not be changed. In fact, only half of the actual total of 13 qts can be changed by dropping the pan. There are places where they flush the transmission, but stories are known of transmission problems after this.
That the fluid can loose its bright red color over time and become more of a brownish, is quite normal, but it should not become black or smelling burned.
Regarding the ATP kit, i have never used it myself, but have not heard anything bad about them. Be aware that the inlet filter is different for 4x4 and for 4x2 jeeps.
One tip for when you are going to replace the oval inlet filter: install the seal first in the pump inlet with the butt end of a hammer or alike, and then install the filter neck into the seal. Not doing this and trying to install the seal, while its already on the filter neck, most probably will result in a detached filter and a jeep stuck somewhere halfway a trip.
Our member Tony did a write-up on the fluid change with some pictures, so have a look here: How to service 545RFE transmission
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Old 08-15-2015, 10:43 AM
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Re: ATP tranny filters any good?

Thanks for the feedback. I went ahead and used the ATP kit. My CES is back on with 0987 again. What is the next easiest step? Line pressure sensor or 4C pressure switch?
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Old 08-15-2015, 12:51 PM
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Re: ATP tranny filters any good?

The line pressure sensor is not involved with this fault code. Its the pressure switch which sits inside the TRS/solenoid block. You could first try and clean the large connector on the left side of the transmission. It connects directly to the solenoid block connector. A bad contact due to moisture or corrosion should be discarded first, but if that doesnt help, then the whole TRS/solenoid block must be changed.
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Old 08-15-2015, 01:26 PM
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Re: ATP tranny filters any good?

Thankd

---------- Post added at 05:26 PM ---------- Previous post was at 04:52 PM ----------

I think I found it but couldn't get it loose. I'll try again later. How difficult is changing the TRS/ solenoid block? Average price? The thing that bothers me is that 5 his thing drives and shifts great. No slip or clunk. I've driven mild and hard with no symptoms. We just bought it used and need a Mass state inspection which can't happen with a CEL on. She wants to return it due to this issue.
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Old 08-15-2015, 10:51 PM
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Re: ATP tranny filters any good?

The large connector on the TRS/solenoid block had a locking lever, which must be swept down for the connector to unlock.
The TRS/solenoid block costs around USD 260 i believe. Have a look at e-bay or here: www.electricaladvantage.net I bought my block at electrical advantage several years ago. To change it, the whole valve body has to come down. No rocket sience, just some basic tools required.
When you changed the fluid, was there any debris in the pan or on the magnet? You said that the fluid was dirty.
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Old 08-15-2015, 10:54 PM
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Re: ATP tranny filters any good?

No actually the pan and magnet were pretty clean. First jeep but I've had a many mopar vans so I've seen dirty pans and magnets.
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Old 08-16-2015, 12:46 PM
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Re: ATP tranny filters any good?

I just experienced it not shifting right. Into 5th I believe.

---------- Post added at 04:46 PM ---------- Previous post was at 04:38 PM ----------

At 60 MPH the tachometer was at 3000 rpm. Turned it off waited 10 seconds and now at 60 it at about 2000 rpm.
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Old 08-16-2015, 03:17 PM
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Re: ATP tranny filters any good?

Still the same fault code set? Did you manage to get the large connector of and check the pins? Eventhough the mentioned fault code many times is the pressure switch, it can also be the related shift solenoid which doesnt work. But until now you never had any shifting problems, right?
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Old 08-16-2015, 05:47 PM
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Re: ATP tranny filters any good?

My wife says she had the problem twice before and never mentioned it. I haven't had a chance to try the plug again.

---------- Post added at 09:47 PM ---------- Previous post was at 08:52 PM ----------

Shift solenoid is a much easier and cheaper repair. 25 USD and 30 minutes of work.
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Old 08-17-2015, 09:23 AM
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Re: ATP tranny filters any good?

I dont know where you got this info from, at least it is not true. At least i have never seen the solenoids been sold separately. You can open the TRS/solenoid block, but have to do it with great care. If you can find a solenoid, then you have to check which solenoid block you have: the old black connector or the new white connector. They have different types of solenoids and are not interchangeable. Also, if one solenoid went bad, you have a change that a next one will follow soon. You can buy a repair kit for the pressure switches as well, but have to look very well the position of the membranes. Reversing their positions will cause the pressure switch not to function. Ask me how i know that.
Certainly it will not take half an hour to replace, since the valve body has to come out to get to the solenoid block. You will also need a new gasket for the solenoid block.
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Old 08-23-2015, 08:49 AM
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Re: ATP tranny filters any good?

Brought it back to the dealer and it was repaired. Runs great now! Thanks for all the help.
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