Gen V swap questions - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 21 Old 10-24-2019, 01:15 AM Thread Starter
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Gen V swap questions

I found a 2018 LT L83 engine with a 8l90 Trans and Tcase 30k miles locally and at $1500. Comes with harness and accessories. I figure sold, but I can't seem to find too much on install. I emailed Robbie at Motech a few days ago but still no response.

I suck at wiring and would prefer some no measure type of engine and trans mounts to help me along, but I'll piece the rest of the needed parts as I go.

Looks like I can keep the NV241OR and sell the 3.8 new trans and chevy tcase, with the tcase pretty much paying for engine and trans from what Im seeing them go for online, but may have to ditch the rubicon case since Im running 5.13s and the trans having such a low 1st gear as well, but ill figure that out later.

Has anyone done a Gen V swap yet, themselves? All the posts Ive seen leave my questions unanswered or they had someone do the swap. Im too poor for that.

Or if you're BFFs with The guys at Motech, RPM and whoever else, I'm seeking a plug and play harness and engine/Trans mounts. Or if you wanna spoon feed me links that I may have over looked, I am ok with that too.
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post #2 of 21 Old 10-24-2019, 08:04 AM
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Last I checked the rubi t case is not compatible with the 6l80. Im betting its the same with the 8l80?

Give Robbie a call. He is way too over worked to get to emails in a timely manner.
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post #3 of 21 Old 10-24-2019, 11:25 AM
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https://www.jkowners.com/forum/engin...on-thread.html


Down the page a ways, @0lllllll0 RPMEXTREME shows the adapter they came up with for the 8speed and NON- Rubi TC. So I would assume the rubi case is a no-go.

I'd call any of those guys before emailing.

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post #4 of 21 Old 10-24-2019, 01:50 PM
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There is a stub shaft available to run the 241OR behind the 6l80 however I would not do it. The 4:1 and 4:1 ratios end up at a 16:1 low ratio which is too low for general wheeling. In addition the OR front input will most likely not hold up to the torque of a Gen V LT.
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post #5 of 21 Old 10-24-2019, 05:52 PM Thread Starter
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I did find a way to use the Rubicon case on the 8l90 but it was accidental. Specifically looking for it gets me nowhere, unless it's the same as the 6l80 then RPM has it. Either way, as mentioned above, using the 241OR isn't going to do me any favors. Plus make some money back selling it. See if I can run the stock tcase that's on the LT set up.

Guy, I did see that post but at 2am, I saw the opening message talking about the Gen IV I skipped over it. Thanks for posting it back up, it definitely answers my questions. Appreciate ya.

I hate cold calling because in my head I imagine them being busy as hell, just like I am and during the daylight hours, hard to be sitting on hold. figure with an email, they can get back to me when they can without being rushed.
Not sure why I think that, but it's my first instinct.
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post #6 of 21 Old 10-24-2019, 09:12 PM
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I'm at about the same stage of this as you, engine, trans etc bought...fyi I bought a 241j t-case from the salvage yard for $200 and sold the chevy case for $300
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post #7 of 21 Old 10-24-2019, 10:50 PM
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Quote:
Originally Posted by FatCow View Post
Either way, as mentioned above, using the 241OR isn't going to do me any favors. Plus make some money back selling it. See if I can run the stock tcase that's on the LT set up.

I've never understood the "can't use the 4:1 TC because it's too low for the low first gear". Well then.........run it in second or third.

Where are you located? I have the non-rubi TC out of my Jeep still sitting here, has 26k on it. I'd like to get rid of it, but I'm not dicking with shipping it

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post #8 of 21 Old 10-25-2019, 08:41 AM
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What power level do you think a 241OR can handle?


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post #9 of 21 Old 10-25-2019, 09:03 AM
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Since many cases have cracked on them....with a stock motor.
Like others have said don't use one.

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post #10 of 21 Old 10-25-2019, 09:37 AM
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Originally Posted by CT Performance, Inc View Post
Since many cases have cracked on them....with a stock motor.
Like others have said don't use one.
Define many? I have been here a long time and I dont recall a plethora of cracked case cases round here...


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post #11 of 21 Old 10-25-2019, 10:14 AM Thread Starter
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HMS, why so low? Just trying to get rid of it? Looking online, they go for a pretty penny.

Guy, I'm actually only 2 hours from you when I am not working in that area. What are you trying to get for it? I also figured a different trans gear but people smarter than me have said it's a no go.

As for the 241OR, I know they are strong as hell, just not as strong as a 205. Chain and case being the weak link. I do recall reading the torque numbers being way up there and able to run 400+HP though. I suck at math so cant really tell you what the torque rating would read out as in 1st/Lo but I feel like Id be going nowhere with 4:1/4.56 1st/5.13s.
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post #12 of 21 Old 10-28-2019, 11:27 AM
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I did the swap myself using a Motech kit. L86/8L90/Atlas. Using a L83 will reduce some costs in the cooling department, but I think that's really minimal.

Your rubicon transfer case is not compatible, and I don't think you can control the GM transfer case without a BCM, but I'm not sure on that. It's a long transfer case. I would suggest to get a normal JK Case if doing this on a budget.

Read the Motech documents a few times, lots of good info there. Downloads

The kit is pricey, but overall it is well thought out. You will need to send them your jeep's engine harness to be reworked as well as the L86's harness. Engine mounts are bolt in and have some adjustment to position the engine where it doesn't hit anything. You will most likely need to lift the body up some. I welded together some washers and got longer bolts, doesn't need but about 5/8".

You will need HP tuners to get it working right and not have the dash lit up. Being a 2018 engine, it's more costly to unlock than the 2016 and down. Go to the HP tuners website for more info on that. The transmission computer is also going to be locked, but you shouldn't need to get into that.

Transmission takes a special oil, it's pricey and may not be available everywhere.

There are a couple guys on this forum that have done the swap, read up. One said he is using the stock JK radiator with his L83. The cooling fan is a different animal but I'm sure there are a few ways of attacking that now. Most expensive way is using a Camaro SS fan controlled by the GM computer. That'll also cool the best.

Even tightest budget, making sacrifices along the way, I bet you're still over 10k before you're done.

But it is worth it!
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post #13 of 21 Old 10-28-2019, 08:14 PM Thread Starter
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Thanks for the input. I've been reading like crazy. I think I am just going to post up my Engine/Trans/case and just foot the rest of the bill on a cc to make the swap easier than trying to piece it together on something ive never tackled or even seen in person before.

I am running the L83, about to toss it up on the engine stand when I pick up the bolts tomorrow and start removing the harness and to clean up the engine a bit. Fairly dusty. I want to find some numbers to see exactly what I have, I seen the guy has a couple of ads with different years, so I just want to know exactly what I have.

The case is removed from the set and will be sold to fund the swap. Not sure if its the 261 or the other one yet as there is no tag on it, so once I figure that out Ill toss it up.

Motech did get back to me in email with a price but told me I should call for details so once I get free time from work, I am going to do that.
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post #14 of 21 Old 10-28-2019, 09:21 PM Thread Starter
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I've been watching a few videos and the info Doc they provide in the link and from what I am reading, it's almost like not much is needed outside of electrical stuff and the EZ mounts and the obvious PS mount. My cooling system will work as is. Fuel works as is. Can get the exhaust built locally or through them.

Luckily I wont even need to remove the body.
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post #15 of 21 Old 10-29-2019, 11:32 AM
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Quote:
Originally Posted by FatCow View Post
HMS, why so low? Just trying to get rid of it? Looking online, they go for a pretty penny.

Guy, I'm actually only 2 hours from you when I am not working in that area. What are you trying to get for it? I also figured a different trans gear but people smarter than me have said it's a no go.

As for the 241OR, I know they are strong as hell, just not as strong as a 205. Chain and case being the weak link. I do recall reading the torque numbers being way up there and able to run 400+HP though. I suck at math so cant really tell you what the torque rating would read out as in 1st/Lo but I feel like Id be going nowhere with 4:1/4.56 1st/5.13s.

I'd take $100 just to free up the space. PM me when you know you'll be near if you decide you want it , I work out of country, so I'm gone for months at a time. In fact I'm headed to Egypt in a couple weeks for probably a month. I'm not actively trying to sell it, so it's not going anywhere.

Kevin
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post #16 of 21 Old 11-14-2019, 08:06 AM
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I think we may still have some of the 32-23 spline adapters. RpmExtreme 32-23 Spline Rubicon Transfercase Adapter :: RPM Extreme

I have never personally tried to use one on a build but in theory it should work. Its pretty beefy but I can't vouch for its strength.





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post #17 of 21 Old 11-17-2019, 02:38 PM Thread Starter
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That's pretty cool, never even knew those were available. How thick would the adapter have to be to use this? When I look at the Atlas stuff, I keep wanting to come back to the 241or..

After googling forever, I found out that the engine is actually a 2016. The trans has a 6U8L sticker, so after stressing out google, it finally told me what it meant. Still not sure if the Tcase is a heavy duty unit or not, but NQH-AHA seems to lean that way. Ill let whoever buys it stress over any other info.
Seems the engine came out of a Tahoe or escalade, both seem to have these same options.

Finish cleaning it up and then wait for someone to buy my powertrain.
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post #18 of 21 Old 11-18-2019, 10:57 AM
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Originally Posted by FatCow View Post
That's pretty cool, never even knew those were available. How thick would the adapter have to be to use this? When I look at the Atlas stuff, I keep wanting to come back to the 241or...
Our 8L90E adapter bolts up to the stock GM 4wd housing on the back of the trans and is about 3/4" thick. You may have to trim some off of the output shaft to account for the adapter shaft.


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post #19 of 21 Old 11-19-2019, 11:51 AM Thread Starter
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I'll definitely keep this in mind. Is it a part you guys are no longer carrying? I see the link on your website shows it's not available.
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post #20 of 21 Old 11-19-2019, 02:23 PM
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I'll definitely keep this in mind. Is it a part you guys are no longer carrying? I see the link on your website shows it's not available.
We took it off of the site a while ago. I think I still have a few in stock if you need one.


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post #21 of 21 Old 11-19-2019, 10:24 PM Thread Starter
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Originally Posted by 0lllllll0 RPMEXTREME View Post
We took it off of the site a while ago. I think I still have a few in stock if you need one.
I believe I will be hitting you up on that. Are you releasing the wire harness to the public yet? That seems to be my biggest hurdle on where I want to go with this. Motech only offers it in their kit, but reading your info, it seems like the harness will get me where I need to be on the hardest part of this swap. (I hate electrical) They did say they'll sell the bolt in motor mounts separately, but doesn't help me much if I don't have the wiring.

I keep going back and forth if I just want to run a stand alone harness and "hot rod" the other needed stuff or what just yet. The cheapness of the stand alone is appealing but would rather not deal with the dash and AC stuff. The wife also likes the factory interior look.

I have a 2011 JKU rubicon.

Last edited by FatCow; 11-19-2019 at 10:35 PM.
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