Yes and no.
I believe that you can reuse your hardware without any problems.
The problem will be with the shocks. The bushing on the 2014 FJ front is different from the 4Runner bushing. You will need to do some work to adapt the front shocks so they will mount.
Also, for the rear shocks, there appears to be some differences that will also require some work to get the rear shocks to mount.
Search the forums for information.
Here are a few threads to get you started, but there may be other solutions to the problem too. You'll need to do some searching.
Good luck!
http://www.toyota-4runner.org/4th-gen-t4rs/200447-modding-5th-gen-fj-shocks-fit-4th-gen-4runner-easy.html
http://www.toyota-4runner.org/4th-gen-t4rs/159642-5th-gen-4th-gen-suspension-swap.html
As for the springs, you should be good to go. Just know that for the front springs, the left and right springs are different. One is slightly longer than the other. You can distinguish them by their height and also by color coded paint markings on them. This thread (should) have more info on it. Do a search if necessary.
[MENTION=147838]nhaniger[/MENTION] , for the rear shocks it seems that the bolt on the 2014 FJ is a larger diameter than on the 4th gen 4runner. So some people suggest drilling out the hole in the frame on the 4th gen 4runner to accommodate the larger bolt from the 5th gen FJ.
That would mean one of two things (to me) for your situation.
Either 1 -- you will need to get a spacer or insert of some (unknown) size to take up the extra space of the larger shock, or, you will need to get the correct 5th gen FJ sized bolt for the rear shock, and modify your T4R by enlarging the hole in your frame to make it fit. If it were me, I'd look at trying to find / fabricate a busing to take up the excess space and use my existing hardware without modifying my frame.
I can't really tell you what to use or suggest good approaches, because I just don't know enough about materials, and how they react under wear and/or pressure.
I'm assuming if you have access to a good machine shop, that they should be able to advise you an fabricate some inserts. I don't know enough to tell you what materials would be good to use. Maybe someone with more knowledge could chime in and help with ideas.
See for instance this:
Yeah iv'e also read a lot that the modification required you to drill the bolt hole on the chassis larger to accommodate the larger bolt diameter. Is that's what they refer to when its stated that "modification" is required? Cuz if so that's not a very big deal.
Also does anyone know what ride height gain a setup like that would produce?
Here's an fix that someone tried as listed in Ark Swamp's thread on lift height gained from FJ cruiser suspension swaps.
I lifted my 2004 4wd 4 runner this past weekend. 122,00 miles on the truck. stock measurements from the ground to center of wheel well front was 33 and the rear was 35. I bought 2012 FJ Cruiser rear coils and front strut assembly with toyota struts with 12,000 miles. I installed a 1 1/2 inch spacer in rear and 2 inch spacer in front. (top mounted) finished results are 36 inches front and 37 1/2 rear. Also the lower mount on my truck was 39 mm and the lower strut assembly was 41 mm. I read about grinding and all that but we took the lower control arm off and decided there is not enough material to grind on the mount. So, I took a piece of 1/8 steel placed inside of the mount put a long bolt through the other side placed a bunch of washers on the bolt inside the mount then placed a nut on the end of the bolt snugged it up against the steel then took an impact wrench and tightened up the bolt even more which of course spread out the mount. this worked perfectly!! The other side we left the lower control arm on and just did the same thing while still on the truck. We loosened up the alignment bolts on the lower control arms so they would fall out of the way. Marked them and it worked great.
Also, I *think* that people are saying that the 5th gen FJ shocks are a bit soft on (at least some) of the 4Runners. I'm not positive, and that may only be part of the story... there are variables like which FJ your shocks came from (engine size, 4wd, edition) and which 4runner you have (engine, 2wd, 4wd, etc). But I can tell you that the Bilstein 5100 shocks front and back with the FJ springs are a very popular set up, and lots of people (including me) love it.
I got 4 bilstein 5100's delivered for $348 from one of the forum vendors
Total Automotive Performance - Your Source for Auto Parts and Accessories - Homepage
Here's what Ark swamp rider wrote a while ago.
For optimum ride and off road performance, your best option is 5100's front/rear with the FJ springs. My reply above was assuming you wanted to stick with the front shocks you have. 5100's will run about $375 for the set, and would ride better (IF you have the Tokico front's) and also perform better off road. As said, I don't believe there would be a huge difference between 5100's and stock FJ Bilstein's, so it all boils down to what brand the front shocks you have are.
Personally I'm about to go 5100's, but that's only because folks are charging an arm and a leg for the stock Bilstein setups. The 5100 fronts set on the second notch (.85) combined with FJ springs will net around 1.6" lift in the front, .25-.5" in the rear.
Good luck.
-Phil