Anyone try an 8HP70 trans swap into pre-2013 WK2? - Jeep Garage - Jeep Forum

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  #1  
Old 06-09-2015, 10:26 PM
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Anyone try an 8HP70 trans swap into pre-2013 WK2?

Anyone contemplated swapping in an 8 speed 8HP70 (or 8HP90) into their pre-2013/2014 WK2? I've been doing some transmission research and think this swap would be awesome.

However, I realize that some modules, possibly programming of the ECU, and other wiring harness changes might be necessary (ie: $$$$$$). Not to mention sourcing one from a totaled Jeep might be quite difficult and expensive.

Just wondering if anyone has tried it, and if so, what issues did you run in to? I am starting to notice my 2011 5 speed 545RFE transmission is slipping a lot during hard acceleration. So I'm weighing options besides rebuilding a less-than efficient transmission.

I'm a new member, so I apologize if this is in a thread elsewhere. I tried searching several times and didn't find anything on the forum.

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Old 06-09-2015, 11:11 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Interesting idea.

I think you'd be way ahead trading it in towards a 14+ MY
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Old 06-10-2015, 10:02 AM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

I'm thinking that the computer side of things will be the major issue...remember, MY14+ has a completely different electrical/computer bus that's not compatible with earlier models. Trading in for a MY14+ might be a more economical choice!
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Old 06-10-2015, 10:04 AM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

It's been discussed before and pretty much not worth it. Physically getting the transmission in there isn't an issue. It's the TCM, PCM, and all the other modules that need to be reprogrammed to make it work. Plus, as was stated, the bus system is different. Probably better idea to trade up for a Jeep with the 8 speed.
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Old 06-10-2015, 11:04 AM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Thanks for the input, gents. I was thinking the same thing, just wanted to hear a few opinions. I may look in to beefing up the internals of my 545RFE if anything is available in the aftermarket world. Right now it seems to be running fine. May simply have the local dealer look at it since they cover drivetrain for 1 million miles or 5 years. Thanks again, guys.
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Old 06-10-2015, 11:10 AM
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Also the 2014+ has a revised tranny tunnel/floor pan
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Old 06-10-2015, 11:56 AM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

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? I know these aren't building blocks like Wranglers but come on folks!?! Where's the exploded wiring diagrams, folks sourcing modules from junkyards (or new) and plugging them in, adapting them, flashing them, whatever is necessary? I guess it's just a different mentality. I'll get off my soapbox now especially since I am not contributing towards the thread, just needed a little rant.

I say to the OP, go for it! As long as the tranny tunnel isn't too bad of a fit and it's possible to do with the canbus discrepancies for the modules. Keep researching, this would be a GREAT swap for the WK platform that would really bring new life.

Then again, it could very well be impossible. I mean, the WK2 can't even have it's odometer or speedometer corrected when running tires 1.5" taller than stock. Maybe there just isn't enough interest to make the seemingly impossible, possible.
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Old 06-10-2015, 12:21 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Quote:
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? I know these aren't building blocks like Wranglers but come on folks!?! Where's the exploded wiring diagrams, folks sourcing modules from junkyards (or new) and plugging them in, adapting them, flashing them, whatever is necessary? I guess it's just a different mentality. I'll get off my soapbox now especially since I am not contributing towards the thread, just needed a little rant.

I say to the OP, go for it! As long as the tranny tunnel isn't too bad of a fit and it's possible to do with the canbus discrepancies for the modules. Keep researching, this would be a GREAT swap for the WK platform that would really bring new life.

Then again, it could very well be impossible. I mean, the WK2 can't even have it's odometer or speedometer corrected when running tires 1.5" taller than stock. Maybe there just isn't enough interest to make the seemingly impossible, possible.
Lol... are the people on the VW forums really swapping out 2 year old transmissions into 4 year old cars? Somehow I doubt it. What OP is talking about isn't impossible, it's just very, very, very unfeasible without knowing exactly how the shifter, ECU, and transmission talk to eachother. Sure, we know they're using the CAN protocol, but as someone who's developed modules to work on vehicle CAN buses, that's like saying they communicate via WiFi: you know where to look for it and can probably even sniff the messages, but the contents are going to be very hard to decipher without some sort of schema sitting in front of you. The fact that the transmission is on a different CAN bus than the rest of the car should tell you a lot already - that there's so much traffic going on on that one bus that they need to separate it to keep it from overwhelming the rest of the modules on the bus. OP, unless you've got a multimillion dollar lab setup and a dedicated team to spend tens of thousands of hours reverse engineering the transmission, or, you know someone from ZF who will just give you the CAN Schema for this particular implementation, you should probably just trade in.
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Old 06-10-2015, 12:32 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Quote:
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? I know these aren't building blocks like Wranglers but come on folks!?! Where's the exploded wiring diagrams, folks sourcing modules from junkyards (or new) and plugging them in, adapting them, flashing them, whatever is necessary? I guess it's just a different mentality. I'll get off my soapbox now especially since I am not contributing towards the thread, just needed a little rant.

I say to the OP, go for it! As long as the tranny tunnel isn't too bad of a fit and it's possible to do with the canbus discrepancies for the modules. Keep researching, this would be a GREAT swap for the WK platform that would really bring new life.

Then again, it could very well be impossible. I mean, the WK2 can't even have it's odometer or speedometer corrected when running tires 1.5" taller than stock. Maybe there just isn't enough interest to make the seemingly impossible, possible.
There's a lot of stuff that we do swap, explore, explode, adapt, and overcome but we also know when it just isn't worth it cause someone has either done it or we researched the sh!t out of it.
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Old 06-10-2015, 01:15 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

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
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Old 06-10-2015, 02:44 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

my 8 speed is a work of art
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Old 06-10-2015, 03:02 PM
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Re: Anyone try an 8HP70 trans swap into pre-2013 WK2?

Quote:
Originally Posted by Scottina06 View Post
my 8 speed is a work of art
I'm with Scott, the 8 speed in my Jeep has been flawless so far. The 9 speed in my 200 has been fine as well.
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