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  #421  
Old 10-20-2014, 07:26 PM
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I've been contemplating trading my perfectly running GC Ltd. for a 15 model. I think after reading all of the problems discussed on this site I should just keep what I have. What's especially annoying is all of the tranny problems. I thought they pertained to the six cyl model but now I see that even the SRT trannys are a problem.

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  #422  
Old 10-20-2014, 07:35 PM
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Quote:
Originally Posted by jeepgrady View Post
I've been contemplating trading my perfectly running GC Ltd. for a 15 model. I think after reading all of the problems discussed on this site I should just keep what I have. What's especially annoying is all of the tranny problems. I thought they pertained to the six cyl model but now I see that even the SRT trannys are a problem.
Well, actually not really. The Diesel, 5.7 and 6.4 all have same tranny, the 8HP70 from ZF that is 100% physically untouched by FCA. The problems on this and other forums are an incredibly small percent of units out there. The old "only problems get discussed on forums" syndrome.

The V6 has the 845RE which is the ZF 8HP45 that FCA manufactures under license from ZF whereby FCA has modified the clutches, etc to "better handle the torque requirements of the V6". This tranny has a much greater complaint volume on the forums and more TSB's for "improvements". And those complaints are probably very much in the minority across the whole unit base out there.

All I am saying is to put things in perspective when making final decisions.
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  #423  
Old 10-20-2014, 07:50 PM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by jeepgrady View Post
I've been contemplating trading my perfectly running GC Ltd. for a 15 model. I think after reading all of the problems discussed on this site I should just keep what I have. What's especially annoying is all of the tranny problems. I thought they pertained to the six cyl model but now I see that even the SRT trannys are a problem.
The SRT, Diesel and the 5.7 hemi all share the same 8HP70 trans made by ZF. I have seen several reports on here of issues on the diesel and now some on the SRT but the 5.7 has had few which makes me think more of software programing issue but who knows. diesel and SRT put out more torque than the 5.7 so maybe torque related, who knows. the v6 has a different trans, the 845RE and Chrysler mucked with that one its not just a straight buy from zf like the others. there are many people from the various engines that don't have issues so just remember it is not all of them. if you want to improve your odds maybe get the 5.7 but no guarantees there. this forum is a very small percentage of all the 14-15 GCs out there so I would not let it be your only decision point.
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  #424  
Old 10-20-2014, 08:44 PM
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Re: If your 8spd trans is rough, put your hand up

Dave in PA, the weird thing, is that after a battery disconnect or reprograming, it doesn't down shift all the time, it seems to gradually learn to do this for some reason, and it just seems to get worse.... Feels lile someone keeps hitting the brakes when slowing down, craziest thing.... I'm wondering if it is something perhaps in the transfer case or traction control? ... Or just a screwed up software program???? But with all the complaints I'm seeing here, someone has to know whats going on, and since companies like Roll Royce, BMW, and others also use this ZF 8 speed, someone has to know
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  #425  
Old 10-20-2014, 08:46 PM
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Re: If your 8spd trans is rough, put your hand up

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Originally Posted by MSCA View Post
Is it really downshifting? Or is it just not upshifting? Mine will just hold the gear while coasting down a hill. I don't think it ever downshifts coasting down a hill, but it doesn't upshift either.
No it actually downshifts unless you can hold rpm with the gas pedal, as the mph. decreases it will drop to a lower gear IF your foot is not actively on the gas pedal; drives me crazy at times. Most of my upshifting is good even in ECO mode but for the life of me I cannot understand why the "engineers" want it to downshift? Leave that for the paddle shifters if needed, like I said, brakes are cheap compared to the tranny always doing the "brake" work. Dave
PS: Currently at 23,000 miles and this is the only issue I have/had.
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  #426  
Old 10-20-2014, 10:52 PM
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Re: If your 8spd trans is rough, put your hand up

Dave At PA, it's just nuts, mine down shifts rather than coasts in gear, and between each downshift the car slows just like someone is applying the brakes for a moment.... When the services are first done, it coasts and remains in the gear I was in, but as time goes by, it starts to down shift as the vehicle slows, and each shift feels like it's draging with the brakes on, even though they haven't been appled..... That and a slightly weird high frequency vibration at idle are my only issues, other than that I love this Jeep SRT, but truly the trans issues is pissing me off big time, i'm almost ready to dump this car if they can't get it figured out soon.... In a car that will end up costing me around 80k, this is un acceptable, I don't want to spend all my time going back and forth to the dealership across town
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  #427  
Old 10-20-2014, 11:26 PM
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Re: If your 8spd trans is rough, put your hand up

Quote:
Originally Posted by Dave in Pa View Post
Can someone explain the "need" for Jeep to have the software constantly downshift the tranny when going down any kind of incline? Why can't it stay in a high gear like any other automatic I have ever owned, and "coast" until you decide to accelerate and then it can pick a gear to shift to. Brakes are a lot cheaper to replace than wear and tear on a transmission I think?! Dave
Is this 4WD? It sound like the Hill Descent Control is kicking in. (I don't have my car yet so this is just a wild guess based upon reading about it.) Does this happen in any mode?
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  #428  
Old 10-21-2014, 12:08 AM
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Re: If your 8spd trans is rough, put your hand up

Play Golf,
I thought of that, but as far as I can find, the SRT doesn't have Hill Desent as part of its system, but I agree that that would be a close discription of how the problem acts, but it even does it on level ground
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  #429  
Old 10-21-2014, 12:18 AM
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Quote:
Originally Posted by theweavman View Post
Play Golf,
I thought of that, but as far as I can find, the SRT doesn't have Hill Desent as part of its system, but I agree that that would be a close discription of how the problem acts, but it even does it on level ground
Ya, SRT does not have it....I do in my 5.7 Summit and its not what's going on for you. It only works when in 4WD-Low and has like a max speed of 8mph or something super low.

Sounds like a harsh version of what I call (and like very much) "engine braking". For me it is just like the engine braking on a 4 stroke MX bike when you chop the throttle. It will throw you forward a bit with the decel and if u just bang the shifter down a gear (vs using clutch) you get a slight jolt as the tranny very firmly grabs the next gear down.

For me this eases braking effort and just feels like a " positive shifting" tranny. I like crisp trannies from my drag days and hi-stall speed torque converters...sorry for the digresion. I can see where this may be a bit sharp edged behavior for some.

You must have a rougher version of this?
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  #430  
Old 10-21-2014, 01:08 AM
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Re: If your 8spd trans is rough, put your hand up

I used to drag race also, and I too like crisp shifts, even ones that bang thru the gears, and I understand engine braking from the compression, buts its not really like that either, as I said this is difficult to discribe in words, its not consistant which makes it even harder trouble shoot, sometimes you take your foot off the gas and the car remains in the gear it was in and acts like a "normal" transmision" and stays in that gear until you brake to a stop, then other times, as soon as you let off the gas the car feels like your applying the brakes, and begins to kinda harshly start down shifting thru the gears, and at each downshift feels like the brakes are being applied.... As I posted earlier, yesterday I was driving down a long winding steep driveway, the Jeep was in 1st gear, I took my foot off the gas and the car almost came to a stop, then it started going again, then it slowed on its own and again almost stopped, it repeated this while staying in 1st gear, until I applied the gas again, very unusual, and I've been driving and working on cars fir over 50 years.... Both stick and automatics.... I really thought that the new trans valve body would correct the problem , but it hasn't, so I will see what my dealers trans guy comes up with next
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  #431  
Old 10-21-2014, 01:11 AM
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Re: If your 8spd trans is rough, put your hand up

I might also add that I have tried putting the trans in neutral while going down a grade to see if my brakes or someting else was dragging, but nope, the car picked up speed going down hill as you would expect it to do
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  #432  
Old 10-21-2014, 01:21 AM
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To be honest my 11/6/13 build 8HP70 tranny is doing exactly the same things as you describe only not as harshly as yours, just deliberate and firm behavior and something like reverse torque tranny braking in the downshift regime.
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