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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

What is this discussion about? Jeep Grand Cherokee, SUV


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#2431 of 2465
Re: Transmission slippage on Grand Cherokee [enegma] by kara5272
Oct 25, 2007 (6:29 pm)
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Replying to: enegma (Oct 24, 2007 9:02 pm)

This condition occurs during regular driving on the streets or freeways at anytime the speed gets above the range where it should shift into overdrive (55 ~ 65mph). The slipping is only in and out of overdrive after the car has warmed up (normal operating temp). The average outdoor temp range is 55 - 75 this past week when the problem began.
 
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?
#2432 of 2465
Re: Transmission slippage on Grand Cherokee [kara5272] by enegma
Oct 26, 2007 (1:21 am)
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Replying to: kara5272 (Oct 25, 2007 6:29 pm)

Kara,
 
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.
#2433 of 2465
08 nav vs 07 nav by casolorz
Nov 13, 2007 (9:26 pm)
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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.
#2435 of 2465
Re: 08 nav vs 07 nav [casolorz] by verdugo
Nov 14, 2007 (1:00 pm)
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Replying to: casolorz (Nov 13, 2007 9:26 pm)

http://www.edmunds.com/jeep/grandcherokee/2008/review.html
 
Search is your friend. The above page has the changes for 2008.
 
And as a bonus it won't get my post deleted
#2436 of 2465
Re: 08 nav vs 07 nav [verdugo] by casolorz
Nov 14, 2007 (1:12 pm)
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Replying to: verdugo (Nov 14, 2007 1:00 pm)

I will never get why people reply "use google", "search is your friend", "why do you want to do that". If you don't know the answer then don't reply. I already spent some time searching and then I thought the answer will probably be better from an actual owner.
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?
#2437 of 2465
Re: 08 nav vs 07 nav [casolorz] by verdugo
Nov 14, 2007 (1:46 pm)
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Replying to: casolorz (Nov 14, 2007 1:12 pm)

There is a very good website that is dedicated only to the WK Jeep. When I was buying, I found it by searching on google. My previous post got deleted, so I won't mention the site again.
 
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.
#2438 of 2465
Re: 08 nav vs 07 nav [verdugo] by casolorz
Nov 14, 2007 (2:00 pm)
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Replying to: verdugo (Nov 14, 2007 1:46 pm)

Thanks for the reply, much more helpful
 
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.
#2439 of 2465
Re: 08 nav vs 07 nav [casolorz] by verdugo
Nov 14, 2007 (3:13 pm)
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Replying to: casolorz (Nov 14, 2007 2:00 pm)

As I found out the hard way, the E85 option is not available in all states. Very very small print on the Jeep website says that "* Flexible-fuel engine not available in CA, VT, NY, MA, ME, RI, CT and PA. " I'm in CA. It's standard in the rest of the states.
 
Yes, the bluetooth interacts with the navigation screen. When you look up POI, it has an option to call. Is that what you meant?
#2440 of 2465
Re: 08 nav vs 07 nav [verdugo] by casolorz
Nov 14, 2007 (3:24 pm)
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Replying to: verdugo (Nov 14, 2007 3:13 pm)

Wow thats odd, I'll have to make sure I don't buy the car in any of those states.
 
I guess now I have to read to see what people have been getting as price for the limited trim with nav, towing, 4x4. I am hoping to get it close to invoice before the rebates, we'll see.

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