I'm a little jealous you have a 4.0. My 2.5 gets the job done but it would be a nice to have a little more. I have a build thread on here for mine "Secondhand YJ Build".
So I've debated what my path forward on my suspension for the last year and I've decided to keep it simple. Doing a spring over is not as cheap and easy as you might think to do it right. You would need to get a SYE and modify the steering to get the correct geometry back. Plus it's a lot of stress on the stock springs to be placed on top. You could just buy springs and a kit but they are fairly expensive. Or make a bastard spring pack by doing some research on pirate4x4. I was surprised how well the SUA suspension performed. There's no axle wrap like a SOA would have the steering geometry is close to stock. Also you keep a low COG. Plus it's a lot cheaper to trim sheet metal. Someday I may put 1 ton axles underneath and do a SOA but I want to do it the right way and not half ass it. I recommend wheeling the jeep and upgrade as needed. The 4" lift and 33s worked great. Next weekend I will be going to see how 35s do. I did have to trim a little. 4wheeler magazine has a good write up on SOA vs SUA. Hope this helps.
The research I have been doing has noted axle wrap as the most common side effect to a spring over set up not done correctly. I think buying a complete lift or piecing together a frankenlift and staying in with the original spring under set up is going to be the most cost effective and easiest approach at this point. My father in law is set on 35's. I've shown him some pics of your set up and the amount of trimming that is going to have to be done to run them and he said he is ok with it. We will see if he is singing the same tune when I break out the saw zall and grinder. [emoji23]
I forgot to update on where we left off last night. Radiator, AC compressor, and water pump were pulled. I ended up sanding and painting the headlight surrounds and the thermostat housing black yesterday while my father in law was working in the engine compartment. We did some general cleaning of the front end and engine to get rid of all the mud so that I wouldn't be eating shit while I was under it working over the next few months. Here are a few pics.
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The goal for after work today is to get the seats pulled and interior cleaned out and ready for sanding. He wants to go the rhinoline route. If the daylight plays in our favor, we may go ahead and pull the dash so we can replace the heater core and get rid of the bypass that the original owner did. Not sure why you wouldn't just replace it instead of taking the time to bypass it, but to each their own I guess.
Just a suggestion, since I know the rig is sitting outside, I would be sure to put some sort of cap/cover over holes that enter the engine. Would hate to see some dirt or creature get in there and cause all kinds of issues. Also, while we haven't had a cold spell lately, definitely need to look into ensuring that it is freeze-proof soon. Otherwise you'll be replacing a block too.
No water in block, radiator and all plumbing associated with it is gone, and the block is closed up.
Yea, we made sure to get everything out and waterproofed before we had those freezing temps nights about two weeks. I guess I need to be a little more thorough on my shitty ass updates. BTW, we put down a can of rustoleum bedliner on the back. I just went outside and checked it and it came out pretty nice. I'm thinking 2 or 3 more coats. You're welcome to come over and check her out whenever you want.