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  #25  
Old 05-19-2014, 11:48 AM
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Re: For those of you with an 8 speed on the V6

so is it generally regarded that the 845 is a worse tranny than the 870? Or is it assumed because "German built" is often taken as "better built?"
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  #26  
Old 05-19-2014, 12:02 PM
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Re: For those of you with an 8 speed on the V6

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Originally Posted by redddog View Post
so is it generally regarded that the 845 is a worse tranny than the 870? Or is it assumed because "German built" is often taken as "better built?"
No, the evidence just says that the V8, diesel and SRT (all of which use the 870) are not having shifting issues while the V6 (using the 845) has been having multiple shifting issues.

Personally, I think it 's more a teething issue than design or build as the TSB applications seem to be having a positive effect. Time will tell.
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  #27  
Old 05-19-2014, 12:05 PM
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so is it generally regarded that the 845 is a worse tranny than the 870? Or is it assumed because "German built" is often taken as "better built?"
Does the Chrysler modified 845RE have more issues than the non-modified 8HP70? Without question. I believe Chrysler is sortung out the kinks. My post above says it all. This is NOT a German v USA built thing. Chrysler took a proven design and altered it, that's the culprit.
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  #28  
Old 05-19-2014, 12:09 PM
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Quote:
Originally Posted by Roger Ramjet View Post

No, the evidence just says that the V8, diesel and SRT (all of which use the 870) are not having shifting issues while the V6 (using the 845) has been having multiple shifting issues.

Personally, I think it 's more a teething issue than design or build as the TSB applications seem to be having a positive effect. Time will tell.
Eh, both. I think the alteration is adding to the shift programming fixes. Since it us known they altered the clutches and many shifting issues are slamming related, logic (there I go!) says they complicated the shift programming with different mechanicals.

As you say tho, teething.
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  #29  
Old 05-19-2014, 12:28 PM
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Re: For those of you with an 8 speed on the V6

The question is: is it mechanical or software teething?
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  #30  
Old 05-19-2014, 05:55 PM
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Re: For those of you with an 8 speed on the V6

I have a new build (March 2014) Overland w/ V6 and I haven't experienced any transmission issues at all (and I almost always drive in Eco).

[frantically knocking on wood]
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  #31  
Old 05-19-2014, 09:24 PM
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Re: For those of you with an 8 speed on the V6

Quote:
Originally Posted by Roger Ramjet View Post
No, the evidence just says that the V8, diesel and SRT (all of which use the 870) are not having shifting issues while the V6 (using the 845) has been having multiple shifting issues.

Personally, I think it 's more a teething issue than design or build as the TSB applications seem to be having a positive effect. Time will tell.
^^^^

This is likely the best description of what is happening.

The 845RE is "licensed" for build from ZF and trust me they very much care about the reputation of their designs. The new 9 speeds are also a Licensed build.

ZF works with the licenced manufacturers to perfect the software and as we have seen there has been vast improvements to the shift quality and these have been software based.

In retrospect, I believe that the initial release of the software for the 845RE had a great deal of issues with a large group of drivers (some drivers have said and still say it is fine). As it is an adaptive system and this is a new build for Chrysler I believe that it took them some extra time to work it out. Personally, I think they are closer but as there are some people who are not entirely happy, I will tell you all that Chrysler is still gathering data on shift perception and is currently working on future release updates as the 845RE is going to be a centerpiece around their mid-size drive engines.

Back to the German built conversation.... It is built in America, Designed in Germany.... Which to me beats the snot out of designed in California, assembled in China (no disrespect intended to hard working folks in Factories in China, but nice to see good things coming from this side of the water )
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Old 05-22-2014, 08:30 AM
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Re: For those of you with an 8 speed on the V6

I have a 2014 JGC with a build date late 2013. I've had TSB updates in the past and still having issues with my transmission clunking in the low gears, especially when cold. I've seen a few posts w/ people who have had a positive experience after a TSB update, can you tell me which TSB was applied that was successful?
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  #33  
Old 05-22-2014, 08:40 AM
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I still say the mechanical clutch mods Chrysler made to the 845RE are adding to the difficulty in getting programming tamed. To be honest, I don't know how they could not be related. I mean we aren't talking about tranny cooling or gearing mods, we're talking about clutch mods to handle the different V6 torque reqs than ZF designed the base 845RE for.

My only reason in pushing this point is that I think Chrysler is challenged in filing off some rough edges as a result of their design mods.
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Old 05-22-2014, 09:12 AM
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Quote:
Originally Posted by 14SummitHemi View Post
I still say the mechanical clutch mods Chrysler made to the 845RE are adding to the difficulty in getting programming tamed. To be honest, I don't know how they could not be related. I mean we aren't talking about tranny cooling or gearing mods, we're talking about clutch mods to handle the different V6 torque reqs than ZF designed the base 845RE for.

My only reason in pushing this point is that I think Chrysler is challenged in filing off some rough edges as a result of their design mods.
Chrysler did not make much in the way of design changes to the 8. It is built to the standard of the license for the 8HP45.... And even on the part level, they haven't changed much.

No different than the 9 speed, realistically the problems will be dealt with Via programming changes.

Not saying that maybe there isn't some build perfection going on but I know people with the first run of this transmission who have no updates and no problems. That would not point to a design problem from Chrysler. On the other hand the way it is adapting to some peoples driving styles is not acceptable. That is where they are making the strides.
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Old 05-22-2014, 09:43 AM
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Re: For those of you with an 8 speed on the V6

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Originally Posted by Willx View Post
Chrysler did not make much in the way of design changes to the 8. It is built to the standard of the license for the 8HP45.... And even on the part level, they haven't changed much.

No different than the 9 speed, realistically the problems will be dealt with Via programming changes.

Not saying that maybe there isn't some build perfection going on but I know people with the first run of this transmission who have no updates and no problems. That would not point to a design problem from Chrysler. On the other hand the way it is adapting to some peoples driving styles is not acceptable. That is where they are making the strides.
I guess it matters how you look at it. I am a distrusting old fart when someone messes with another's recipe so to speak.

The 8HP70 (V8/Diesel) is the ZF design (zero mods) bolted in with Chrysler application specific programming. This unit has had zero mechanical issues (for argument's sake) and only minor programming issues with few gripes.

The 845RE (V6), however, is a physical modification of the base un-modded ZF 8spd (8HP45). In my research prior to my purchase I found this several places:

"Known differences between the 8HP45 and 845RE include:

the 845REs clutches (which have extra friction plates for improved performance) and, for some vehicles, a higher capacity oil pan.

Many internal parts do not interchange between the 845RE and 8HP45."


I am not saying it's a design problem only that the two circumstances just have to be related. I truly believe the Chrysler design changes induce variance into their programming adjustments.

Also, agreed, many are happy and the problem units are probably a small subset of population.
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  #36  
Old 05-22-2014, 10:08 AM
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Re: For those of you with an 8 speed on the V6

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Originally Posted by 14SummitHemi View Post
I guess it matters how you look at it. I am a distrusting old fart when someone messes with another's recipe so to speak.

The 8HP70 (V8/Diesel) is the ZF design (zero mods) bolted in with Chrysler application specific programming. This unit has had zero mechanical issues (for argument's sake) and only minor programming issues with few gripes.

The 845RE (V6), however, is a physical modification of the base un-modded ZF 8spd (8HP45). In my research prior to my purchase I found this several places:

"Known differences between the 8HP45 and 845RE include:

the 845REs clutches (which have extra friction plates for improved performance) and, for some vehicles, a higher capacity oil pan.

Many internal parts do not interchange between the 845RE and 8HP45."


I am not saying it's a design problem only that the two circumstances just have to be related. I truly believe the Chrysler design changes induce variance into their programming adjustments.

Also, agreed, many are happy and the problem units are probably a small subset of population.
Chrysler also changed them slightly so they could produce more in a year. The other design doesn't allow the same production capacity as Chrysler's does.
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