Just curious what the average JK'r would rather have: 6.4 (392) Hemi SRT V8 mated to their NAG1 (WA580) or 6.2 LT1 with 10L80?

I am back in a JKUR (Recon) and have the torque/hp bug. I have done my research and am trying to compare apples-to-apples turnkey swap-wise; prices are very close/high (Rubi-Trux vs MoTech).

Would probably just get an L96 6.0 6L80 from MoTech, but I want to stay EPA emissions legal in as many states as possible (HD engine in a half-ton etc) because I might move to an emissions strict state like Colorado and want the ability to sell to it in as many states as possible way down the road. The 6.4 Hemi offers the simplicity of the iron block without all the CVVT, Direct Injection, AFM (point of failure). The LT1 is lighter and has the superior transmission (10L80). 6.4 also makes more power stock and will probably leave the engine stock for the most part.

Thanks in advance for your votes and comments.

 

I am a huge LS fan, but if I were doing a swap in my JK, it would probably be to a Hemi. I've seen first hand some of the headaches from swap harnesses and converter boxes. I would want factory reliability, and none of the LS swap Jeeps that I have seen have that. Plus, with the Hemi, you are a CAI and tune away from 500hp.

 

Legal??????????????? good luck with either as its never gona happen for many states where the resale market is.

 

I have a 2017 JK Recon also. It has 4.10's on both ends. I think they all came that way. R U sure you have a 3.73 rear?

 

Yeah, the Monroney (window sticker) and butt-dyno say 3.73 front/rear; I think it is because of the Max Tow Package/Auto Trans combo?

 

I did not vote because if you are going this route the best option IMO is the 6.2LT (LS are dinosaurs now) with 10 speed 10L90 transmission. The advantage of the LT vs LS is the direct injection, better AFM lifter system and the front accessory system. LS uses a bastardized aftermarket setup (unreliable) for Jeeps whereas the LT we use the Chev setup, including AC compressor, and simply add the Jeep PS pump and longer serpentine belt. Robbie at Motech is helpful here.
The 392 Hemi setup I don't know about other than the tranny might not hold up and it is only 5 gears. But $$ wise it could be better.

 

Get a LS3 6l80e proven reliable motor and trans...Call John Schumacher he will give you the truth on which Chevy motor and trans to use and the issues with some.

 

No need to sell me on the LS3 6L80 combo, I am definitely a believer (had an L94 6L80 in my Yukon Denali). The issue for me is to be as compliant with laws/regulations now and in the future as possible. I need to use the same model year or newer engine (I have a 2017 JKUR Recon) for the same vehicle weight/class (half ton). So I need a 2017 (or newer) engine that was used in a 2017 model or newer. LS3 was not used in any GM production models in 2017 to the best of my knowledge. L96 6.0 (my preference) was used in 2017 production 3/4 and 1 ton heavy duty trucks, SUVs, vans, but the JKUR is considered a half-ton vehicle.

This is why I am comparing the 392 Hemi to the LT; though there are other good GM Gen V engines (L83, L86), I am comparing performance engine with performance engine.

So why am I making things difficult on myself? I want to be as compliant as possible with a stock V8 engine tune and full emissions kit because: I don't really want to pollute more than I must, likely will move to an emissions-strict jurisdiction, and knowing myself I want to be able to sell to the widest swathe of buyers including those in jurisdictions with very strict emissions. The way I see it, EPA standards are going to be more strict not more lenient in the near future.

 

I am from the frozen north but do understand some of your EPA regs. From what I have been told is if you are running a 2017 Jeep means you have to install an emissions compliant 2017 or newer motor in your Jeep to pass smog tests if they are applicable to you and good for resale. That means in a Chev you will get an LT engine 2017 or newer. LS were gone at 2013. This info came from Robbie @ Motech and I understand he was an employee of EPA once before in a senior role.

 

Yessir, that is my understanding as well from Robbie, and the internet.