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  #601  
Old 04-27-2015, 11:01 AM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by Jsboening View Post
I can't understand why they can't get it to shift like the Ram 1500. I drove one with the Hemi and 8 speed combo and it was flawless. Not a single rough shift up or down. It was kind of a weird sensation actually, my mind was so used to the 6-5 clunk that when it didn't happen it really caught my attention. I'm baffled as to why the programming for the Grand Cherokee is so far off.


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For what it's worth, I'm currently not experiencing anything close to what some others have experienced with my 2015. I'm definitely not getting anything unusual in the middle or high gears.

The only thing I run into regularly is the thunk going into first if I come to a full stop, then instant start off before it has time to get into first. If I stop for at lest one second, I don't have it. If I do a California stop, I obviously don't get it either since it never hits first.

What it sounds like, is they could eliminate that issue by having it shift to first when you get under 3MPH so it will be there for those quick stop and go situations. Right now, it waits too long, then is trying to stab itself into gear when you try to start off.

Even with that issue, it's not overly harsh. I can hear the thunk and it feels no worse than someone kicking my seat. It's definitely not like being rear-ended as others have reported. I got that exactly once in a traffic jam and it hasn't happened again.

So, I would say, with one minor tweak, the transmission would be exactly fine for me.

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  #602  
Old 04-27-2015, 11:27 AM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by NetworkTV View Post
For what it's worth, I'm currently not experiencing anything close to what some others have experienced with my 2015. I'm definitely not getting anything unusual in the middle or high gears.

The only thing I run into regularly is the thunk going into first if I come to a full stop, then instant start off before it has time to get into first. If I stop for at lest one second, I don't have it. If I do a California stop, I obviously don't get it either since it never hits first.

What it sounds like, is they could eliminate that issue by having it shift to first when you get under 3MPH so it will be there for those quick stop and go situations. Right now, it waits too long, then is trying to stab itself into gear when you try to start off.

Even with that issue, it's not overly harsh. I can hear the thunk and it feels no worse than someone kicking my seat. It's definitely not like being rear-ended as others have reported. I got that exactly once in a traffic jam and it hasn't happened again.

So, I would say, with one minor tweak, the transmission would be exactly fine for me.

This is very reassuring to hear as I have a new SRT on order to replace my current SRT lemon. I'm worried that the new one will have the same problems and there aren't any on the lot to test drive. It's has been a great vehicle in every other respect.


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  #603  
Old 04-27-2015, 11:49 AM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by recoil1911 View Post
Just curious if that TSB they performed included the quick relearn procedure. The shifting on mine went to total crap afterwards. After the second quick relearn the service guy said I would notice some harsh shifting as the transmission adjusted. I put up with it for a week and couldn't take the very hard shifting any longer so I rebooted the vehicle by disconnecting the battery. Made a huge difference. Keep us posted on the post service visit.
They did a quick re-learn procedure on the vehicle, which did little help. I did the battery dissconnect and that didn't do a thing (maybe make it worse). 1-2 is rough but sometimes 5-4 can be a rough jump as well.

Quote:
Originally Posted by Jsboening View Post
I can't understand why they can't get it to shift like the Ram 1500. I drove one with the Hemi and 8 speed combo and it was flawless. Not a single rough shift up or down. It was kind of a weird sensation actually, my mind was so used to the 6-5 clunk that when it didn't happen it really caught my attention. I'm baffled as to why the programming for the Grand Cherokee is so far off.
Your talking about 2 different transmissions. Remember that the V6 version of the tranny is built by FCA and the V8 version is actually from ZF.
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  #604  
Old 04-27-2015, 11:59 AM
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Re: If your 8spd trans is rough, put your hand up

Quote:
Originally Posted by Jsboening View Post
This is very reassuring to hear as I have a new SRT on order to replace my current SRT lemon. I'm worried that the new one will have the same problems and there aren't any on the lot to test drive. It's has been a great vehicle in every other respect.


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I will say, though, I still think Eco mode is kind of joke. I can get far better gas mileage by using the shift paddles.

The two issues I see with Eco mode:

- It hangs too long on 5th and 6th gear before upshifting. This is after jumping through the lower gears pretty quickly. Unless I'm really giving it gas, it should stay under 3K and it gets over that in both 5th and 6th when heading up to 40MPH. If I manually shift from 5 on up, I can cruise in 7th at 40-45MPH.

- It downshifts far too easily, even under low acceleration. I give it a little gas to go up a small hill, it downshifts at least 2 gears. I give it a small amount of gas to catch up with traffic or pass someone, it does the same thing. If it only went down one gear to start, then another if I pressed the gas harder, I'd be OK with that. As it is, on roads where I can mostly maintain one speed, I flip it to manual so it doesn't do that.

The result is, I can easily average 15-16 MPG in town traffic by doing some manual shifting while "eco" mode ends me up closer to 12-13MPG. On the highways, I can get 26-27 average by locking it into 8th (except for the occasional shift to 7th on hills or to pass and a rare 6th for very steep grades). Auto Eco mode gets me more like 21-22 because it wants 6th for every hill and 5th for steep grades. That puts the RPMs ever 4K, which is well more than it needs for those conditions.

I'd probably do better on the highways in both modes if it weren't so hilly around here.
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  #605  
Old 04-27-2015, 12:14 PM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by SnoFire View Post
They did a quick re-learn procedure on the vehicle, which did little help. I did the battery dissconnect and that didn't do a thing (maybe make it worse). 1-2 is rough but sometimes 5-4 can be a rough jump as well.



Your talking about 2 different transmissions. Remember that the V6 version of the tranny is built by FCA and the V8 version is actually from ZF.
Absolutely, plus, you cannot even compare the same tranny between platforms. The "untouched by FCA" tranny (8HP70) in the Hemi JGC and Dodge Ram 1500 have different programming from Chrysler since they have different operating envelopes....FWIW.
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  #606  
Old 04-27-2015, 02:00 PM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by Jayhawkeye3 View Post
I had the latest TSB applied and it actually got worse. We are heading out on vacation today and we are gone for a week, so we dropped the Jeep off for more work. The owner of the dealership and the lead service guy said there are "definitely some tweaks they can make" to help me out, so I'm hopeful they identify and fix the problem.


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Which latest TSB did you have applied? Was it 21-004-15 dated January 24, 2015? I'm now getting the 2-1 harsh downshift after they re-flashed module 18-19-05-L9 (what it said on my work order) without me knowing they would when I went in for my free oil change last week. TSB 21-004-15 reflashes module 18-19-05-A3 which I am hoping fixes it.
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  #607  
Old 04-27-2015, 04:50 PM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by SnoFire View Post
They did a quick re-learn procedure on the vehicle, which did little help. I did the battery dissconnect and that didn't do a thing (maybe make it worse). 1-2 is rough but sometimes 5-4 can be a rough jump as well.







Your talking about 2 different transmissions. Remember that the V6 version of the tranny is built by FCA and the V8 version is actually from ZF.


Quote:
Originally Posted by 14SummitHemi View Post
Absolutely, plus, you cannot even compare the same tranny between platforms. The "untouched by FCA" tranny (8HP70) in the Hemi JGC and Dodge Ram 1500 have different programming from Chrysler since they have different operating envelopes....FWIW.

I thought the jeep SRT and Hemi equipped Ram both had the same transmission?

I think if they can get it to shift right in one platform it shouldn't be a real stretch to get it to work in another.


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  #608  
Old 04-27-2015, 05:07 PM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by Jsboening View Post
I thought the jeep SRT and Hemi equipped Ram both had the same transmission?

I think if they can get it to shift right in one platform it shouldn't be a real stretch to get it to work in another.


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Correct same in the Diesel as well. It's also in the BMW 7 Series (F01), BMW X5 (E70), Dodge Durango V8, Iveco Daily, Ram 1500 V6, V8, & diesel, Range Rover Sport (2012), Rolls-Royce Phantom, Maserati Quattroporte (2013), Dodge Charger V8 (2015-), Dodge Challenger V8 (2015-)....

Imagine all the different axle/gearing/horsepower/2WD/4WD/AWD combos....that creates the need for application specific programming across all those platforms...

And, yes, I agree if they can get it right on one/most why not the JGC? At least they are actively working it as evidenced by all the TSB's..
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  #609  
Old 04-29-2015, 12:33 PM
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Re: If your 8spd trans is rough, put your hand up

Took my 2014 V6 Summit in a couple of weeks ago to get a TSB done since all of a sudden at around 2500 miles the downshift from 2nd to 1st was getting bad. Jerky type shift. Had it done and drove it for a bit. That issue seems to have been fixed, however now when the trans is cold, and by cold I mean first thing in the morning and not necessarily freezing cold it does a very hard shift from 2nd to 3rd.

Anytime I gave it gas to merge or pass someone the shift would jerk you in the Jeep. Even my wife noticed it and she isn't picky on problems like I am.
So off to the dealer it went again. The Jeep has been at the dealer since last Thursday. Their tech looked it over and I was informed they were able to replicate the hard shift and contacted Chrysler engineers to assist. The first thing they are going to do is change the valve body. Hopefully I get the GC back tomorrow or by Saturday the latest.

It sucks since I love the truck and was extremely happy with the way it shifted from the day I got it last November. I traded a 14 Limited hemi for this and was not disappointed going from the V8 to V6 performance wise since for how I use it, it feels almost the same.

The dealer has been great so no complaints there at all. I got a rental (v6 Charger woot! lol) from them and they have answered all my questions. I did call and opened a case with customer care and they were real pleasant to deal with. The rep even escalated the issue.

I really hope the valve body fixes the issue but just in case I opened the case anyway. The charger has the v6 and the 8 speed trans that I imagine is in the GC. That doesn't seem to have the shifting problems.

We'll see what happens
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  #610  
Old 04-29-2015, 02:16 PM
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If your 8spd trans is rough, put your hand up

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Originally Posted by collosus76 View Post
Took my 2014 V6 Summit in a couple of weeks ago to get a TSB done since all of a sudden at around 2500 miles the downshift from 2nd to 1st was getting bad. Jerky type shift. Had it done and drove it for a bit. That issue seems to have been fixed, however now when the trans is cold, and by cold I mean first thing in the morning and not necessarily freezing cold it does a very hard shift from 2nd to 3rd.

Anytime I gave it gas to merge or pass someone the shift would jerk you in the Jeep. Even my wife noticed it and she isn't picky on problems like I am.
So off to the dealer it went again. The Jeep has been at the dealer since last Thursday. Their tech looked it over and I was informed they were able to replicate the hard shift and contacted Chrysler engineers to assist. The first thing they are going to do is change the valve body. Hopefully I get the GC back tomorrow or by Saturday the latest.

It sucks since I love the truck and was extremely happy with the way it shifted from the day I got it last November. I traded a 14 Limited hemi for this and was not disappointed going from the V8 to V6 performance wise since for how I use it, it feels almost the same.

The dealer has been great so no complaints there at all. I got a rental (v6 Charger woot! lol) from them and they have answered all my questions. I did call and opened a case with customer care and they were real pleasant to deal with. The rep even escalated the issue.

I really hope the valve body fixes the issue but just in case I opened the case anyway. The charger has the v6 and the 8 speed trans that I imagine is in the GC. That doesn't seem to have the shifting problems.

We'll see what happens

Try to get whatever you can out of the customer service dept. if you plan on keeping that GC. I had them add onto my VIN 3yrs of free oil changes to help make up for the aggravation I went through in my 2014.

In the end it didn't matter because I was bought out my '14 and swapped into a '15. Should be any day now that i take delivery.


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  #611  
Old 04-29-2015, 02:39 PM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by antsjeep View Post
Try to get whatever you can out of the customer service dept. if you plan on keeping that GC. I had them add onto my VIN 3yrs of free oil changes to help make up for the aggravation I went through in my 2014.

In the end it didn't matter because I was bought out my '14 and swapped into a '15. Should be any day now that i take delivery.


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Oh yeah don't take me wrong, I will push to get something from them. The car has low miles and I've only had it since end of Nov. I already have the lifetime Maxcare on it.

I appreciate that they are working with me and taking care of the issue but I am still out my Jeep and that sucks.

On a side note I keep messing with the wife that if this becomes a big issue I am getting a sports car. We have her SUV we don't need two lol
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Old 04-29-2015, 02:44 PM
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Quote:
Originally Posted by collosus76 View Post

Oh yeah don't take me wrong, I will push to get something from them. The car has low miles and I've only had it since end of Nov. I already have the lifetime Maxcare on it.

I appreciate that they are working with me and taking care of the issue but I am still out my Jeep and that sucks.

On a side note I keep messing with the wife that if this becomes a big issue I am getting a sports car. We have her SUV we don't need two lol
'15 'Vette Stingray is only a grand or 2 more than the Summit (V8), just sayin'.....I envy u man, my wife's got the sedan but if she had the dog hauler this cat would be terrorizing the burbs with my 7spd missile.....I hate u, I was over this til your post! You suck!
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