Ok heres some info on the springs...
First off they do there job for a while. Mine lasted 2 weeks. I went offroading after 2 weeks of putting it on the shackles were on the frame rails.
Like 4speed said the H3T may benefit a bit due to the fact that T springs are softer and this is for a 3 so it will be a tad stiffer and may retain height a little bit better
Here is the design flaw IMO.
The actual spring is 2 inches longer then the stock spring which makes ZERO sense, well it does somewhat in terms of ride quality goals set out by rancho but a spring that is staying in the same mounting position shouldnt be longer. If more lift is needed it should be arched more. Here is where I learned that. Deaver springs, His heavy duty lift springs were the same length as my stockers but gave more lift then the longer spring itself.
Stock vs rancho spring
Deaver uses the same length with a bigger arch and puts the shackle in a happier place
Rancho pushes the shackle back for a softer ride
I understand why there goal is a soft ride. 90% of people who lift their 4x4s, trucks, etc dont wheel. Its all about the ride quality for on road.
So I see problems with the spring itself and my personal answer to cure it is to start over with a new spring. Is it necessary? Hell no, tons of people wheel the crap out of them with the rancho springs but I opted to go a different route. I understand that not everyone can just go chopping away at their rig and do a spring over because I was in those shoes and it took me a while to come around. So for bolt on options
Get a custom spring done with more arch like I did from deaver, you can go to a local spring shop and have them build you a set
Keep the rancho springs and do air bags
or shackle
or add a leafs
I just dont want people to be bummed out when its sagging right away.
So with all that said, is it a great kit? YES. Does it have flaws? YES. but every design from stock to modified has pros and cons. If something was 100% awesome then everyone would do it. I would definitely do the kit again. It rides great and performs well on and off road. I would say that some other things to look out for is custom ucp as the bars eliminate that, I did some tube and welded it in and made one piece and it works great and for mud it doesnt matter but for rocks I bent the bar mounts forward so I need to weld them into place
Another thing you might want to look out for is the fact that the steering rack bolt is in the way. In the event of changing it then it requires torsion bar removal LCA removal and crossmember removal. Notch it the crossmember and it will be easier then stock removal due to the added room the lift provides.
COG: It goes up but your tires go out also. I understand the goal of lowest height biggest tire but remember in a purpose built buggy that is much more feasible where you can keep everything clearanced high and tucked away get a big tire and a low height but in vehicles like a Hummer, jeep, other 4x4s I think a mild 2-4in lift does wonders as we dont have that flat belly. I wouldnt worry about the COG with this kit your not going up 8in only 4 lol. I havent rolled and have been put on some steep side slopes, the added clearance has put me in places where a stock height one would struggle.
I think the biggest thing here is to be open to further modifications. Remember, my reason for lifting it was to further enhance its capabilities and to further enhance the capabilities of the rancho kit some modifications should be done and the nice thing is that it doesnt have to be done all at once, over time I changed things and made it better. It this is all for looks its just bolt in and go but this kit can be used for tough wheeling too.
Lastly, go ahead and do it and have fun with it and Tapadt3t I would do a spring over if you plan on doing a solid axle swap as you stated after the warranty. Rancho it spring over it and its one less thing to do later.