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  #469  
Old 01-29-2013, 01:48 AM
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Re: Grand Cherokee + sand = FAIL

From looking at http://www.wk2jeeps.com/2013/2013_wk...ifications.pdf it says:

"Axle Ratios 3.07:1 — 3.6-liter engine; 3.45:1 — 5.7-liter engine"

I didn't know it was engine specific..?
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  #470  
Old 01-29-2013, 01:54 AM
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Re: Grand Cherokee + sand = FAIL

Actually, this is probably more up-to-date:
Jeep Grand Cherokee WK2 - Maintenance information and schedules

Front axles 195mm FIA (all models)
Axle ratios:
3.45:1 - 3.0L
3.07:1 - 3.6L
3.45:1 - 5.7L
3.70:1 - 6.4L

The 195 MM FIA (Front-Independent-Aluminum) axle is an independent assembly with an aluminum housing and differential.


Rear axles
215mm RII (3.6L)
3.06:1 axle ratio
The 215 MM RII (Rear-Independent-Iron) axle is an independent assembly with a cast iron housing and differential. The 215 MM RII uses an open differential which is supported by two tapered roller bearings located on either side of the case.

225mm RII (5.7L)
3.47:1 axle ratio
The 225 MM RII (Rear-Independent-Iron) axle is an independent assembly with a cast iron housing and differential. The 225 MM RII uses an open differential which is supported by two tapered roller bearings located on either side of the case.

230mm RIA (3.0L, 5.7L, w/o ELSD)
3.47:1 axle ratio
The 230 MM RIA (Rear-Independent-Aluminum) axle is an independent assembly with an aluminum housing and differential. The 230 MM axle can be equipped with or without ELSD (Electronic Limited Slip Differential).

230mm RIA (3.0L, 5.7L, 6.4L with ELSD)
3.45:1 axle ratio 5.7L
3.70:1 axle ratio 6.4L

The 230 MM RIA (Rear-Independent-Aluminum) axle is an independent assembly with an aluminum housing and differential. The 230 MM axle can be equipped with or without ELSD (Electronic Limited
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  #471  
Old 01-29-2013, 01:55 AM
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Re: Grand Cherokee + sand = FAIL

Quote:
Originally Posted by Swampy View Post
So, does that mean those vehicles with a diff ratio of 3:45 (pretty sure thats all Overlands) don't get the problem or is that they just don't have a fix for for vehicles with the 3:45 diff ratio as yet?
Good question! Mine is a Laredo 3L CRD and it also has a 3:45 diff and yes, I havn't had a problem in sand... yet.
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  #472  
Old 01-29-2013, 02:05 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by Jimmyb7 View Post
Hi All,

I got an email from Shona at Chrysler today. She said Jeep has released an official software update to fix the sand driving issue and it will be available from all dealers from tomorrow. Hopefully this can now be applied to all vehicles during their next service.
I would love to see that email too..
I had my 10K service done today and mentioned it to the service manager and he "claims" to not know anything about the fix. I told him I know there is a fix and would get the TSB or part no. etc for him, so he can do his job properly...

Copy and paste into this thread or a PM would be much appreciated..
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  #473  
Old 01-29-2013, 02:12 AM
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Re: Grand Cherokee + sand = FAIL

Quote:
Originally Posted by BobT View Post
Good question! Mine is a Laredo 3L CRD and it also has a 3:45 diff and yes, I havn't had a problem in sand... yet.
My 3.0L CRD has had the issue as did my friends 3.6L Petrol. I'd be inclined to double check prior to assuming that you don't need the upgrade. Trust me, if your driving in a really remote location, its best to have 4WD!

I've got my software update, but the problem is with all the heavy rain in QLD there is no soft sand for me to test the fix!
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  #474  
Old 01-29-2013, 03:44 AM
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Re: Grand Cherokee + sand = FAIL

Quote:
Originally Posted by Swampy View Post
So, does that mean those vehicles with a diff ratio of 3:45 (pretty sure thats all Overlands) don't get the problem or is that they just don't have a fix for for vehicles with the 3:45 diff ratio as yet?
After having a further conversation with the service manager who incidently, tells me the area service manager is now working at the dealership and is familiar with the issue, I discerned the following:

Jeep has determined the problem relates to the diff. The module fix is for vehicles with the diff ratio of 3:09 (I am assuming he meant 3:07) and involves updating the software and replacing the module. Apart from running the latest software, there is no fix (as yet) for vehicles running a 3:45 diff ratio at this time.

Putting 2 and 2 together from earlier posts, it would appear that Jeep have not nailed this problem for all affected vehicles and that is why there is no TSB across the range.

As my vehicle has the latest software and a diff ratio of 3:45, no fix is available at this time.
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  #475  
Old 01-29-2013, 03:54 AM
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Re: Grand Cherokee + sand = FAIL

Quote:
tells me the area service manager is now working at the dealership
Can I ask which dealer you are using?
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  #476  
Old 01-29-2013, 04:12 AM
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Re: Grand Cherokee + sand = FAIL

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Originally Posted by GMWK2 View Post
Can I ask which dealer you are using?
Parramatta Motor Group. Good guys, am very happy overall with my dealings with them. I was surprised to see another post recently bagging them. I have had excellent service from both sales and service depts. The sales manager I dealt with is now the GM and I found him to be a great guy to deal with and attentive to customer service.

I had a fairly lengthy conversation with the service manager about a range of issues which I wont go into, I think its bad form to have a private conversation and then post chapter and verse on an internet forum, Lets just say I am pretty happy that they are being upfront with their responses. Now as to what they are being told by FCJ in Melbourne..................................
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  #477  
Old 01-29-2013, 04:30 AM
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Re: Grand Cherokee + sand = FAIL

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Now as to what they are being told by FCJ in Melbourne..................................
Like you at Parramatta, I have had good service from Castle Hill, but have the same view as you about the communication back to FCJ. I still think FCJ and the dealers are staffed by reasonable men and women who want to do a good job, but the sheer number of sales has caught everyone on the hop.
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  #478  
Old 01-29-2013, 07:25 AM
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Re: Grand Cherokee + sand = FAIL

Hi Guys,

Taking the beast into Castle Hill Heartlands on Friday. They were very polite and respectful and understood what I was talking about on the phone.

In the meantime I drove the baby to Port Macquarie last week and had a chance to take it to lighthouse beach. It was heaps of fun and I didn't suffer any issues (had it on 4wd Low and lowered the air pressure to 18 PSI). Check out a very small clip.
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  #479  
Old 01-29-2013, 08:16 AM
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Re: Grand Cherokee + sand = FAIL

My GC has the 3.45:1 with ELSD and I have had the fix.
I've just returned from a 10 day stay on Fraser Island so gave the sand mode fix a very thorough test (I was only supposed to be there 7 nights but we were stranded by the flooding).

On our first day, the very instant I drove off the barge at Hook point I was in 4hi and sand mode, and had to turn very sharply and as I did this there was a mighty screech, almost like a tyre skidding (but it wasn't because it was on sand). Anyway, as we drove on down the soft sand the car felt very unstable and a lot of vibration. Initially I thought it was just the rough surface, but when we got onto the hard sand the vibration remained. Going above 60kmh felt dangerous, a lot of vibration was felt through the steering, and the steering wheel was vibrating from side to side quite violently.

Hmmm, I bought a new vehicle to try and avoid this type of stuff! I stopped the car and had a good look underneath. Nothing appeared broken or loose. With 3 young children also in the car I must say I was very close to turning back. I could still select 4lo and seemed to be able to still pull through the soft sand OK. So I thought I would see if I could get down to Eurong (probably half an hour or so down the beach) and seek assistance there if needed. I must say that I was freaked out a little.

By the time we got to Eurong the problem seemed to have rectified itself. I really had no idea at the time what it was. So I powered on. Next was Indian Head, conditions were very dry and I was still worried something more sinister was wrong. Anyway, as I drove up there was a Prado stuck in the middle. Poor guy had crying kids in the back and it was 35 degrees or so and every one was driving past. So out with the snatch strap and we got him out. OK so now I'm feeling a bit more confident that the jeep isn't about to die!

As we got up near our destination the last couple of roads were boarded so the surface would not allow a tyre to slip like on the sand. I still had it in sand mode and as I turned the corner I heard the screeching sound again just the same as occurred before the vibration. I slowed right down and straightened up quickly. Aha - could be something to do with the centre or rear diff locking? I found that in auto mode I never heard the noise on the hard surface (no diffs locked?) but in sand mode I did. Anyway I'm still not 100% sure "what" exactly the noise was, but do know that I never had that behavior in sand mode before I had the fix.

Luckily the vibration never returned for the remainder of my trip. However, driving through the inland track to Wathumba creek there was a soft patch of sand that was really quite mild compared to conditions I had breezed through elsewhere, and then I hear the EVIC chime, oh no - "serv 4wd"!

Well I must say I was initially terrified. Stay calm, I told myself, you've had "the fix". And yes, the jeep just kept powering on. I drove on for another half an hour at least with the serv 4wd displayed and it was fine. Had I not gotten the fix I would have been stuck. Then on the return trip home I had the error again. Funny thing was I never had it any other time over more than a week with lots of rough conditions.

So, from my experience I can say that the fix does work. Am a little worried though that there is some funny business going on with the diff's now, but cannot be sure. Will definitely report this to Shona and see what they have to say.
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File Type: jpg serv4wd.jpg (298.4 KB, 28 views)
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Old 01-29-2013, 04:43 PM
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Re: Grand Cherokee + sand = FAIL

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Port Macquarie last week and had a chance to take it to lighthouse beach
Glad you had a good time.
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