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Go Back JeepForum.com > General Jeep Forums > Jeep Engineering - Q&A > 10/24 Q/A Session - Grand Cherokee

ZONE 4.25" combo lift for TJ available at Rockridge4wNEW!! HMF 50"-52" light bar mounting brackets!! SPARTAN LOCKERS are on sale BIG TIME at ROCKRIDGE 4WD!

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Unread 10-24-2007, 03:22 PM   #16
XJK
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suggestion

give more options to the consumer as already stated a bit. the GC has potential for people with off road in mind (because of jeeps current lack of a qualified SUV for off road purposes). Perhaps offer a more "base" model without a million computers etc. There are a lot of people complaining about computer related issues that are directly related to their offroad use. Im well aware that jeep doesnt condone off road use with their vehicals as it voids warrienties etc. but also understand that the main reason jeep is jeep is because of its various offroad communities. So give the consumer more options for base models and/or better options for the off roader in mind. This will not only help your sales to the offroad community but also for people who cant afford the higher end CG's but like its design and some of the benefits it provides.

my

-Kyle

As a side note, I know that the JF community appreciates your time with us and we always look forward to your visits. so thank you.

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Unread 10-24-2007, 03:22 PM   #17
HDC
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List of items I've collected since '05

Not nearly as ugly as it sounds!

Since I bought my Grand in March '05 I've been far more pleased with it than I ever expected. This is a fine car that has exceeded all of my expectations in a Jeep. But here's my list of various things I'd love to see in future Grands. You all don't need to respond directly unless you've got something other might find useful. Just sharing my thoughts!


Mechanical list:

-Room for up to a 33" tire in the spare carrier
-Put in more greasable bushings
-True oil life indicators
-Make ESP defeat an EVIC option, not a short lived dash button
-Make the TPMS controller amenable to running on low pressure when offroading. Maybe have it silence warnings when in low range.
-Trailer brake controller wiring that doesn't require an aftermarket harness purchase and install. Big time bonus points if you put in a trailer braking system option like Ford has in the new Superduty line.
-AUX power wires for CB use, like the TJ's used to have.
-For the love of all that is holy, do away with the chrome clad wheels. Chrome is fine, just do it right.
-The dreaded front upper ball joint bolts. Can't that be reconfigured so it isn't in the way of larger tires?
-Give the dealers more Starscan options for different tire sizes
-What ever happened to DHS? I'd love to see this show up someday. Electronic manual disconnects like the JK has would be fantastic too.


Mom, safety & fun item list:

-Six, not four, LATCH connectors in the rear seats
-Auxiliary floor mounting locations in the rear for lashing down rear facing car seats (ala European standards)
-Rear head restraints that don't interfere with proper mounting of any car seat. Removable is good way to go too.
-Active head restraints
-Grocery bag hooks on both sides in the rear cargo area.
-Make the reversible load floor container larger
-HD radio support
-Be innovative - put a USB port in the dash, independent of head unit, that can be used to charge a cellphone (microUSB is being set as a standard shortly) and/or an iPod or other media device, or even a handheld GPS unit. Extra points if you can support iPod control.
-Daytime running lights for US too, as GM does
-LED based signals front to rear
-Make the front side markers easier to replace (Go ahead and try it. Just make sure your chiropractor has room for you in their schedule first!)
-Double click window down feature from key fob
-Grill insert design that allows for easy & cheaper customization, including front piece and rear insert.
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Unread 10-24-2007, 03:22 PM   #18
jeepinjunkie
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Hello,

I have a grand cherokee with the 5.7 hemi engine.

I read somewhere that the truck is programmed to only achieve about 70% WOT in first gear, is this true?

Thanks,
Andy
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Unread 10-24-2007, 03:25 PM   #19
JeepEngineers
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Quote:
Originally Posted by Sporer65
To go along with what Mendelmax said, I too would like it if the WK has some type off offroad group besides skid plates. Include an electronic rear locker, a front limited slip, some more aggressive A/T tires, and perhaps a down hill decent control. Model it after the Land Rovers, not many people will take if offroad, but if they were, they would have no problem doing so.
Thanks for your input!

The WK has had ELSD's available in the front and rear axles since 2005 - they have the torque capacity of a locker. For 2008 we have made Hill Descent Control standard on vehicles with a 2-speed transfer case (and it works great! We think it blows away the competition.) Some of us would also like to offer a more aggressive A/T tire as an option so keep asking - we do have other constraints such as road noise and fuel economy objectives to meet also.
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Last edited by JeepEngineers; 10-25-2007 at 07:20 PM..
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Unread 10-24-2007, 03:26 PM   #20
wightman
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1) Is it possible to retrofit 05-07 with 08 HID headlights (plug and play)? If not plug and play, how difficult?

2) I would be very interested in a selectable electronic rear axle locker for QTII
vehicles.

3) I am very pleased with the ability to put 3" speakers in the dash. This allows for great midrange clarity (where all the vocals are) . I do wish the door speakers were a normal 6.5" speaker though. A USB port for the front of the radio is a MUST.

4) The all black interior is beautiful on the 08 SRT. The smooth dash without the hump for the nav is very nice. The soft touch dash is an improvement. Who wants to drive a $40K vehicle that feels like a Lego model? I don't like the two tone seats on the other 08 models though, the color contrast is too harsh/stark and will be out of style very quickly (if not already).

5) There was previous discussion on how some owners thought WJ seats were more comfortable than WK seats; but after spending a lot of time in my WK, the seats are very very comfortable. The side bolsters could be improved for a more snug fit.

6) The wheels on the 08's are neither stylish nor classic. Why?

7) When the doors are locked, a flush mounted door lock pin would be nice. I had bruises on my elbow the first month of owning my Jeep. To unlock the rear doors, just pull the handle twice (as engineered in VW's). It's the little things that make the difference!

8) A piece of rubber where the driver's left foot sits while drving, or perhaps the floor mat could cover that "hump/ramp" area.

9) This is a source of serious discussion on all jeep forums that I've visited; it's also a very sore topic among many owners...even people that I stop on the street and talk to. 2005-2007 WK's with the 545RFE transmission are suffering early shifting (mainly in 4th gear). The result is a vehicle that lugs and shudders from 30 mph to 55 mph. It would be like shifting a manual transmission into 5th at 30mph; or driving a vehicle in the wrong gear while under load. One fix is to run the vehicle in tow haul mode (in fact, many dealers have acknowledged the problem and have been recommending this as a "fix"). The second fix is to always accelerate at 1/2 to 3/4 throttle to keep the vehicle in high rpms where the shudder is not felt, but where's the logic or gas savings in that? A third fix is to use the auto stick feature, but why have an automatic transmission then?

- Had I noticed this on the short test drive that I took, I would not have bought this vehicle...It's that much of a problem.

10) It takes way too much throttle to down shift (I have the 4.7L and 545RFE). If one desires to accelerate moderately you have to give what seems like an enormous amount of throttle, which then results in a down shift. When the vehicle downshifts and your foot has the throttle down that far, you end up accelerating much faster than desired. So then you let off the gas and the vehicle goes back to lugging. This is the point where I usually end up using the auto stick because the vehicle is incapable of performing as desired.
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Unread 10-24-2007, 03:28 PM   #21
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Quote:
Originally Posted by CEPCNC
A few of us were asked to bring a trip fault "P 103C" found on the DTC Report of a Jeepsunlimted member. He just wants to know what that code means and if it is at all related to what he calls the rear differential noise. He has a 2007 GC Hemi with QDII(Limited model.)

I can't find the "P103C" fault code in the list I have here. I'll have check another source. "C 103C" is rear wheel speed sensor high. It's possible that a faulty wheel speed sensor is causing the rear differential to engage.

Check out the sensor and change the axle fluid. Be sure to use the recommended 75w140 fluid and Limited Slip Additive.
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Unread 10-24-2007, 03:30 PM   #22
wgirvine
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Auto Trans Shifts Hard

I have a 2000 GC Laredo, I-6, 2-wheel drive, driven only on-road. It has been very reliable for the last 130,000 miles, but since new the transmission has always shifted hard, or acted "confused."

It shifts ok from a dead stop, but any change in acceleration from a steady state causes the trans to kick down 2 gears, then immediately back up one gear, with much jerking and screaming from the engine. It will also kick down much too easily. I've learned to adjust for this by using the lightest possible touch on the accelerator pedal, but it is rather annoying.

I have heard that this is common with the I-6 transmissions, but has Jeep come out with any fixes for this? Or do I just have to live with it?

Thanks for your time,
Bill
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Unread 10-24-2007, 03:30 PM   #23
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I really like the new location of the EVIC controls on the steering wheel on the 2008 models. However, there is one major flaw with how the menu choices are laid out. On prior models, one could access the menu and then scroll through all of the listings. Now, inexplicably, the Tire Pressure is on a separate "channel" apart from the other items. On this channel other listings will come up at random, but only one or two of them. Then, one must try and figure out how to get into the other mode to show the rest of the listings, and what happens is that you end up in the programming mode ("yes", "no" etc.). Very frustrating!

Common sense would dictate that the programming mode should be "hidden" or at least require a 2-button sequence so one does not end up in that mode all the time. The old system was SO much more intuitive, WHY did they make this change, and have there been other complaints?
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Unread 10-24-2007, 03:31 PM   #24
ajs800
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Transmission Problem

To follow up with what Robpp asked...

I have a 2006 4.7L 28X laredo with 26k miles and have been having issues with the tranny. The motor luggs horribly in 4th and 5th gear (when it's into OD) and even two different 5 Star dealers have told me that it's not right, but that it's a common problem. Mine is so problematic that they receommend that I use the 'tow button' when driving around town. I've had the Tranny fluid and filters changed and computer flashed several times and it has not improved things.

I believe many on the the forum are experiencing this problem with this tranny with the 4.7 and HEMI, some worse than others? I am wondering, will there will be a TSB/recall for this problem in the near future?

Thanks in advance.
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Unread 10-24-2007, 03:31 PM   #25
VinoTJ
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3rd Row

My wife and I have 2 kids and our 2001 WJ & 2005 TJ. We added a 3rd vehicle to the stable and unfortunately it was not a Jeep. We leased a Volvo V70 Wagon which has an available 3rd row seat - perfect if "mom" needs to pick up the neighbor's kids but able to be stowed/removed when not necessary.

Any possibility for a 3rd row of seats in the Grand Cherokee? This would sway us back to Jeep for "Mom's Car".
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Unread 10-24-2007, 03:32 PM   #26
jeepinjunkie
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How restrictive is the stock exhaust on the Hemi equiped Grand Cherokee?

About how much horespower might be gained by installing the Mopar cat-back, or one of the other cat-back exhausts available?
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Unread 10-24-2007, 03:36 PM   #27
JeepEngineers
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Quote:
Originally Posted by mendelmax
I don't have any question yet, but one improvement suggestion came to my mind when test driving WK and watching it- I suggest to add some sort of swaybar disconnect, maybe something like Rubi JK style.
It could really improve the Wk offroad behavior (sure, WK benefits from ELSD, but sometimes more tire grip is a must), and people would definitely want to have this option.


The other suggestion- I understand, that mass products have to be somehow "idiotproof", but please, leave people more choices in options than you do now. When sitting in WK I feel somehow restrained by all computers. For example permit to turn ESP completely and not turn again automatically; if you'd add swaybar disconnect, make it button operated without 5 computers monitoring "if driver really needs it". Driver knows better what he needs.
Thanks for the input. Sway bar disconnect is definitely something we would like to include in a future model for off-road performance improvement.

Re: computers, etc. There are two good reasons for computers deciding when and when not to activate a feature. The first is that they provide a means for a driver who is unfamiliar with the feature to enjoy its function without having to do anything (for example, ELSD function). My mother would be able to enjoy all the tractive effort capability of the QDII WK/XK without having to push a button or use a special driving technique. The most important, though, is provide for safe usage of the feature under as many conditions as possible. Unfortunately, in the law-suit happy US, this must be done to protect Chrysler from liability litigation if a driver doesn't use good judgement. Sophisticated, knowledgeable drivers then have to suffer the limitations the computers impose to keep others safe. In fact, legal requirements may soon require ESP to automatically turn on at every key cycle - sorry we don't control that.
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Last edited by JeepEngineers; 10-25-2007 at 07:12 PM..
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Unread 10-24-2007, 03:37 PM   #28
JeepEngineers
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Quote:
Originally Posted by Crookster777
A few days ago I was pulling out of a gas station and I had the wheel turned all the way to the left and I went to step on the gas and when I did I was getting no response, so then I look at the dash and the WK died. And the Oil light was on. What was that all about?

We'll have to look into this. We're not aware of this issue. Can you give us more details - Did it only happen once? What engine?
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Unread 10-24-2007, 03:38 PM   #29
JeepEngineers
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Quote:
Originally Posted by wightman
1) Is it possible to retrofit 05-07 with 08 HID headlights (plug and play)? If not plug and play, how difficult?

2) I would be very interested in a selectable electronic rear axle locker for QTII
vehicles.

3) I am very pleased with the ability to put 3" speakers in the dash. This allows for great midrange clarity (where all the vocals are) . I do wish the door speakers were a normal 6.5" speaker though. A USB port for the front of the radio is a MUST.

4) The all black interior is beautiful on the 08 SRT. The smooth dash without the hump for the nav is very nice. The soft touch dash is an improvement. Who wants to drive a $40K vehicle that feels like a Lego model? I don't like the two tone seats on the other 08 models though, the color contrast is too harsh/stark and will be out of style very quickly (if not already).

5) There was previous discussion on how some owners thought WJ seats were more comfortable than WK seats; but after spending a lot of time in my WK, the seats are very very comfortable. The side bolsters could be improved for a more snug fit.

6) The wheels on the 08's are neither stylish nor classic. Why?

7) When the doors are locked, a flush mounted door lock pin would be nice. I had bruises on my elbow the first month of owning my Jeep. To unlock the rear doors, just pull the handle twice (as engineered in VW's). It's the little things that make the difference!

8) A piece of rubber where the driver's left foot sits while drving, or perhaps the floor mat could cover that "hump/ramp" area.

9) This is a source of serious discussion on all jeep forums that I've visited; it's also a very sore topic among many owners...even people that I stop on the street and talk to. 2005-2007 WK's with the 545RFE transmission are suffering early shifting (mainly in 4th gear). The result is a vehicle that lugs and shudders from 30 mph to 55 mph. It would be like shifting a manual transmission into 5th at 30mph; or driving a vehicle in the wrong gear while under load. One fix is to run the vehicle in tow haul mode (in fact, many dealers have acknowledged the problem and have been recommending this as a "fix"). The second fix is to always accelerate at 1/2 to 3/4 throttle to keep the vehicle in high rpms where the shudder is not felt, but where's the logic or gas savings in that? A third fix is to use the auto stick feature, but why have an automatic transmission then?

- Had I noticed this on the short test drive that I took, I would not have bought this vehicle...It's that much of a problem.

10) It takes way too much throttle to down shift (I have the 4.7L and 545RFE). If one desires to accelerate moderately you have to give what seems like an enormous amount of throttle, which then results in a down shift. When the vehicle downshifts and your foot has the throttle down that far, you end up accelerating much faster than desired. So then you let off the gas and the vehicle goes back to lugging. This is the point where I usually end up using the auto stick because the vehicle is incapable of performing as desired.

Ok... I will try to take this on-
1. The retrofit would be costly and require other upgrades other than just the headlamp, sorry. We believe that the lamp will fit however - it requires a different connector and the leveling sensors on the suspension would be difficult to add. The HID headlamp is a complete assembly that includes the ballast.

2.The QDII ELSD system has the torque capacity similar to a locker - it's the QTII transfer case + ELSD's

3.USB port ... hey now available for 2008 with any "MY GIG" Radio

4.Thanks for the suggestion!!

5.Glad to hear you are satisfied, as always it is great to hear about satified customers

6. Sorry, what else can I say- Everyone has a personal taste

7. For 2008, we have changed the door panel on the front doors, and the lock knobs have been removed

8.Thanks for the suggestion!!

9. We answered in a previous post .. check it out

10. Again, not directly answering your concern... but many of our systems are designed to run at optimal fuel economy.

Thanks again for the suggestions!
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Last edited by JeepEngineers; 10-25-2007 at 06:28 PM..
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Unread 10-24-2007, 03:39 PM   #30
HDC
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2000 TJ Wrangler 
 
Join Date: Aug 2007
Location: San Jose
Posts: 4
Biodiesel w/o warranty voiding!

I love my WK and the hemi is pure fun. But in the real world this gas burner is becoming less and less practical every day. So I've been looking towards replacing it with a diesel when the time comes to retire it. But so far most manufacturers will void your warranty if you run anything more than B5-B20 in your diesel, which has been a huge hindrance in going this route. Plus that little problem of not being able to get 50 state legal diesels in anything other than trucks!

Anyway, when I get around to replacing this Grand, I'd really love to do it with a non-NOx spewing (read Bluetec sort of clean) Grand Cherokee. And I'd like to be able to run B100 in it without having my servicing dealer chewing me out for doing so. Can you please push with your engine suppliers (Cummins, Mercedes, whomever it may end up being) to make bio a real option for us?
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