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  #13  
Old 06-10-2015, 02:47 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Thats super your 8 speed is good, so many aren't.... It's the number one complaint for new Jeeps, by a large margin....wish I had yours

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  #14  
Old 06-10-2015, 03:01 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

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Originally Posted by Scottina06 View Post
Also the 2014+ has a revised tranny tunnel/floor pan
That would make for a, umm...interesting...retrofit project. LOL
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  #15  
Old 06-10-2015, 04:12 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

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Originally Posted by theweavman View Post
I would stay far away from the new 8 & 9 speed trannys until they sort out all the problems they have been having with them, Hell if I could, I would love to go back to the older transmissions, my SRT's 8 speed has been nothing but trouble since day one

This is good to know. I have heard a few stories lately from friends with '14 Summits that are not pleased with the 8 speed. Both friends have the 5.7 equipped though, so not sure about the '14s with 8 speed for 3.0 Diesel and 3.6.
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  #16  
Old 06-10-2015, 07:24 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

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Originally Posted by RedStickOffroad View Post
This is good to know. I have heard a few stories lately from friends with '14 Summits that are not pleased with the 8 speed. Both friends have the 5.7 equipped though, so not sure about the '14s with 8 speed for 3.0 Diesel and 3.6.
That's interesting - far more complaints about the 8speed in the V6 (which is manufactured by Chrysler) than the German built ZF unit in the V8 and diesel.
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Old 06-10-2015, 07:24 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

I have a '14 V6 Limited delivered in May '13 and have not had one problem with the 8 speed tranny since the 2nd TSB for the 1st/2nd downshift clunk. I've been amazed at all of the reports of others who have had problems. I hope mine continues to hold up but if it doesn't there is always MaxCare Lifetime.
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Old 06-10-2015, 09:28 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Think they are all ZF designed transmissions, but Chrysler manufactures most of them now under license from ZF, and they are allowed to make some changes.... Perhaps some were made by ZF and perhaps that is why some are fine and some are not
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  #19  
Old 06-10-2015, 09:38 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

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Originally Posted by farfromovin View Post
I'm a new member here, so feel free to hit me in the head with a hammer, and I come from a VW diesel background. One thing I've noticed is there isn't a lot of "OEM+" upgrades that people do with these Jeeps. In the VW community, people are all over swapping trannies with different gear ratios, into different generation platforms, etc. Swapping motors, ECU's, you name it. With the Jeeps I see a lot of "you're better off trading it in and getting a newer one".
Where's the adventure?
What you are describing is very similar to the Subaru community and the typical performance upgrade options. But sadly, what you are describing is generally no longer valid. Gone are the days when you could just swap an STI 6 speed transmission into a 5-speed manual Legacy GT because everything was a mechanical bolt-on.

Here's a few characteristics that communities where part swaps between models and model years are the norm:

1) Car manufacturers have a continuity of platforms, engines and transmissions across models. The same 1.8 L turbo, 2L turbo, 3L supercharged engines are found in everything from Skoda, Seat, VW and Audi. Same "chassis" used in Foresters, Imprezas and Legacy GTs allowed the mating of a 5- or 6-speed transmission to the same EJ255 engine. Sometimes chassis upgrades (e.g. 2005 Legacy GT) form the basis of future models (e.g. 2008-2013 STI).

2) Many of the cars that allow cross-platform swaps are 1-2 generations old (5-10 years old) and turbocharged.

3) Most of the cars that allow cross-platform swaps have manual transmissions and similar ECUs with little body and transmission integration. Often, transmission swaps from an Subaru STI donor to a Legacy GT donor was mechanically possible but locked the transmission into a 50-50 ratio as the DCCD controller was hard to integrate. Most people resorted to aftermarket solutions.

4) Most of the cars that allow cross-platform swaps were staged for performance separation between vehicles of the same brand. Differences in performance came from simple bolt-ons: e.g. STI > Legay GT > WRX > Forester due to a big > medium > small turbo and a similar intercooler set-ups.

Performance bolt-ons are possible for Grand Cherokees: one can get SD, HD or Brembo brakes installed on their ride. RA4 and RA3 radios can be swapped and people have successfully installed radios in cars that did not come with from the factory. I was (one of) the first people to add a front camera to the RA4 radio. In the last few months a supercharger kit was developed for the 3.6 L Pentastar.

But until the same components make their ways in different cars and produce different performance levels, nobody will be adventurous to swap an 8 speed in place of the 5 speed nor will the intake manifold from the Pentastar Wrangler or Charger be considered an upgrade on the 3.6L Pentastar Grand Cherokee.
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Old 06-10-2015, 09:47 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Having started this post yesterday, I have to say I'm pleased with how much feedback has been posted. Glad to have joined a group who is willing to put in their 2 cents and think outside the box; as well as help out a fellow Jeep owner. Having said that, I'm convinced that my 5 speed 545RFE will be staying put until it gives up and needs rebuilding.
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Old 06-10-2015, 09:56 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

With the V8 and the low-winding diesel moreso it might make sense and satisfy certain needs but with the Pentastar I have never understood the point of an 8 speed trans

When you have a flat torque band from 1800 to 6400 you need a low starting gear, a long overdrive, but what is in the middle can be widely spaced, after all the torque converter is another 2+ in the middle and then you lockup where you spend most of your time.

So am curious what is the purpose for a Pentastar other than marketting ?

Now direct injection and boost on 87 PON... Can you say "EcoBoost" ?
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Old 06-10-2015, 10:31 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Quote:
Originally Posted by padgett View Post
With the V8 and the low-winding diesel moreso it might make sense and satisfy certain needs but with the Pentastar I have never understood the point of an 8 speed trans

When you have a flat torque band from 1800 to 6400 you need a low starting gear, a long overdrive, but what is in the middle can be widely spaced, after all the torque converter is another 2+ in the middle and then you lockup where you spend most of your time.

So am curious what is the purpose for a Pentastar other than marketting ?

Now direct injection and boost on 87 PON... Can you say "EcoBoost" ?
I test drove one when deciding which engine to get - and I'll say that the 8 speed makes everything seem 100% smoother. Plus, no torque curve is perfectly flat, and the v6 especially needs to wind up to get any power. Being able to be doing 65 in 4 different gears to have 4 different power profiles available is pretty friggin awesome, no matter what engine it's mated to.
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  #23  
Old 06-11-2015, 11:15 AM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Quote:
Originally Posted by theweavman View Post
Think they are all ZF designed transmissions, but Chrysler manufactures most of them now under license from ZF, and they are allowed to make some changes.... Perhaps some were made by ZF and perhaps that is why some are fine and some are not
Chrysler only manufactures the transmission for the V6 JGC. The other, heavier version, comes from ZF.
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