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Discussion Starter #1
Whats up guys been a while but all is well.
So has anyone thought or tried to swap the new 8speed transmission in a jk?

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Asking the same question. I was advised to change the whole gear in my 2009 jk since I had some problems with it. So could I upgrade by the way to a newer (used) gear? Maybe 5 automatic gearbox from a 2012 jk?


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2017 JKUR Recon AT 3.73 Rear Diff 2" Lift Borla Exhaust 33" Ridge Grapplers on Fuel Wheels 2013 JKU
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Anything can be done with enough time and money; question is, would it be worth the time and expense?

The issues I can think of from the top of my head are:

-Might need a new PCM (ECU) programmed for the newer 8-speed, or need to unlock your PCM so it can be tuned for the 8-speed. The JL/JLU 3.6 Pentastar engines are not identical to the JK/JKU, particularly regarding ESS, E-Torque, and PCM setups.

-Support cross-member for JK/JKU was never designed for the 8-speed. You may need to do some cutting/grinding/welding.

-Transfer Case may not be a direct fit for the 8-speed, so you may need an adapter or just source another transfer case.

At first glance I would say the "juice is not worth the squeeze" unless you are also doing an engine swap and said engine is calibrated for the 8-speed.

Good luck!
 
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2017 JKUR Recon AT 3.73 Rear Diff 2" Lift Borla Exhaust 33" Ridge Grapplers on Fuel Wheels 2013 JKU
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Same issue with the 3.8 V6 as far as I know, and I do not think the 3.8 V6 was ever mated to the NAG1 (WA580) 5-speed ? Maybe someone can confirm this.

I do know there has been at least one successful Pentastar 3.6 swap into a 2007-2011 JK/JKU previously running the 3.8 V6.

It would probably be pretty simple to find a complete Pentastar/NAG1/241J or Rubicon transfer case on eBay/LKQ (in North America anyway).
 
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Discussion Starter #6
good to see ya around , @tapcola !
Yeah, jeep is running great been beating the crap out of it for a year or so now between Sand Hollow and logandale we run 8s all day I'm so happy with the way it turned out .


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