Why not? The lq4 will put out more than enough power for me and I don't need six gears in a transmission. But, and that's a big but, if I can wait long enough then gen 4 stuff may start showing up eventually and I'm hoping I can do the swap this coming up summer. Cost is a huge issue for me as I'm a single father with two kids so cost is the biggest hassle for me so I'm looking at doing this as cheap as I can. I know the parts for swaps aren't cheap but I'm trying to cut costs wherever I can.
I refused to drop $20-30k for a big power V8 swap but I also wanted big power, that's why I'm going the route I am with a turbo Gen 3.
Pricing in the Jeep aftermarket is already insane, but on another level when you get to motor swaps. $20k+ for a LS swap? LOL. $4-5k for a harness, uhh no. I see why some people would go this way, but for me, just no.
Gen 3 truck/suv motors are everywhere, cheap, and fully capable of providing huge performance for minimal investment. If going FI, you could even make a shitty 4.8 work in a pinch.
For the tranny, the 4l80E is still hands down the best bang for your buck. A $200 kit will allow the 4l80E to handle upwards of 800+ HP/TQ. Not bad for trannies that are likely all over your local craigslist for cheap.
The largest downside is what you've already discovered. You're mostly on your own for the swap and integrating with the dash side of the harness is hard. I didn't mind so much and was willing to do all the fab work myself and was also willing to lose creature comforts, if you are not capable of doing that then a Gen 3 would not be a wise choice in my opinion.
If you do use a "swap harness" good luck getting support for cam swaps, injector upgrades, turbos, superchargers, or anything that requires tuning down the road. Every option I've seen in my searches over the years, for any generation of LS, have disclaimers that say you'll void your warranty and support if doing stuff like this. No bueno for me. I'm not going to swap in a V8 then be told to leave it alone.
In the end Ill have saved tons of money, lost tons of time, but learned a lot and have a custom hotrod jeep built to my specs. If I blow an engine doing burnouts on 40's with turbos whistling, then Ill take that Tahoe or Suburban motor that
wouldn't take, swap it in in a day, then keep on rolling.
For creature comforts, Ill work on those over time. I don't need AC/Heat right away but I will be adding it later. Tunes, blinkers, windows, locks, etc can all be custom, stand alone hotrod or aftermarket products, or hacked factory stuff.