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SUVs Jeep Cherokee and Jeep Grand Cherokee Jeep Grand Cherokee
2465 messages, Last post on Nov 24, 2009 at 6:34 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee Forum. Your Hosts are steve_ & tidester
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Replying to: kara5272 (Oct 24, 2007 8:09 pm) Then depending on your mileage and whether you are towing a boat on a regular basis, yes changing the fluid and filter is the best idea. Even flushes require a filter change. Do that second. Then if it still occurs.... Your problem could be the Transmission control switch or sensor that talks to the computer in your vehicle. If it is intermittent(electrical connection) or temperature sensitive(i.e. only slipping when transmission is running hot or cold, or when transitioning from cold running to warm running to normal operating temperature)it could cause the problem your having. However you will need a dealer or transmission shop to verify it. Dusty road conditions, vibration, water, sandy conditions could make the connections intermittent. The transmission control switch is usually located under the vehicle mounted to the transmission housing. If it does not do it at low speeds, have a mechanic check for loose connections or even shorted wiring harness that could be touching the engine chassis. Talk to a mechanic about the issue using my recommendations and write down what you observe. Then that will give him a better idea of where to look. Chances are your transmission will not need to be rebuilt. This is just 2007.You model year was built in 2004. Transmission don't go out in 3 years. If your vehicle has something is really wrong.  I hope what I have stated helps. 
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Replying to: enegma (Oct 24, 2007 9:02 pm) I've read a few other experiences where the transmission filter should be changed and the "O" ring installed properly. Is anyone familiar with this solution?
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Replying to: kara5272 (Oct 25, 2007 6:29 pm) Yes, there are two seals or O-Rings for the overdrive piston in your transmission. If they are worn they need to be replaced. Since the speed range you mentioned between 55-75 will engage the overdrive, this is a area that could cause the problem. The short answer is to service the Overdrive Clutch Unit. That will require the transmission to be removed and this unit removed to be rebuilt. Inside this unit it has many seals and O-Rings that affect the overdrive unit. Here is the list: Overdrive Clutch-Clutch Pack Worn- rebuild of clutch pack Overdrive Piston or Seal malfunction-Either a worn piston or seal(Transmission must be disassembled) Overdrive Piston-Retainer Bleed Orifice worn (Transmission must be disassembled) Overdrive Shift valve,Timing Valve or accumulator malfunction- Valve body has worn accumulator seals requires overhaul of valve body Only two conditions require the transmission to be disassembled. Either way it is not going to be cheap. I would replace the filter and fluid immediately and drive under the same conditions you mentioned as see if that corrects the problem.  If not then the other issues need to be explored further. 
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Can someone tell me what all the differences between the 07 and 08 nav are? other than the hard drive. Thanks.
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Replying to: casolorz (Nov 13, 2007 9:26 pm) Search is your friend. The above page has the changes for 2008. And as a bonus it won't get my post deleted
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Replying to: verdugo (Nov 14, 2007 1:00 pm) I am looking for a comprehensive comparisons between the two nav systems. One is hard drive based, the other is not, what else? I have seen nav systems that all they do is nav and I have seen some that will give you info about the car, control the temperature, etc. So I want to know, is it worth spending the money on an 08 with nav if nav is a very important feature to me? or will the 07 with nav do just fine for me?
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Replying to: casolorz (Nov 14, 2007 1:12 pm) Only you can decide if it's worth it or not. For me it was. MyGig navigation and bluetooth is very cool (and free at the moment due to a Jeep promotion). The hard drive should be faster than the DVD version. Plus you can upload your own songs. However, I never used the 07 Navi. The HID lights were a must for me, so the 07 was not even an option. For you the lights might not be as important. The interior is supposed to be nicer in the 08s than in the 07s. I didn't see the 07, but I quite like the 08. Finally, I got the new generation 4.7L, which is more powerful and more efficient than the 07. For me, it was a no brainer decision to go with the 08. For you? I have no idea. You can't go wrong either way.
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Replying to: verdugo (Nov 14, 2007 1:46 pm) Does the bluetooth (the other must have feature for me) interact with the navigation screen at all? Is the 4.7L e85 always or do you have to request it like that? On the old jeep I think you had the option for it not to be e85 at no cost which I never understood why wouldn't you want it to also do e85 if it was the same cost.
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Replying to: casolorz (Nov 14, 2007 2:00 pm) Yes, the bluetooth interacts with the navigation screen. When you look up POI, it has an option to call. Is that what you meant?
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