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First, I ditto jonb's post, above.
Secondly, I disagree completely: merely installing new 5100's in place of the OEM shocks on the front is not making a significant change. I did that with 140K miles [easy ones] on my 2wd 07 model and it made virtually ZERO diff in the ride [I did front and rear, +0.85 on front seting]. Was effectively waste of time/expense for a LITTLE, TINY bit of improved damping on the front. virtually unnoticeable and of no improvement on the most irritating characteristics of the ride.
jonb I too have looked and looked for comparative reviews that seem to be 'real' concerning ride quality - The problem, or reality of many of the reviews is that the reason for the change was to get a lift, not to deal with ride quality issues. So if it looks cool and rides ok, its a win. I'd really love to hear from someone who has put significant miles/hours on the vehicle since going to the 6112's and tell us about rough backroads, broken pavement, etc hazards of everyday life.
I'm slowing coming around to the idea that the way to address the floppy ride is springs first, shocks second... If it were a motorcycle [I have a couple] that's the way the issue is approached. but I dunno much about 4runner suspension
I think we're talking about two different things with the 5100's. If all you do is swap the shocks to get a lift and don't change the springs, I agree it will not make a significant difference in ride unless your old shocks are worn out. If that's the case, you'll get more damping which will give a more controlled ride, but it will not affect the harshness.
I had 5100's on my 2WD for about 40k miles and had them on my 4WD for about 20k miles. In both cases, I also mounted up springs from a 4WD FJ Cruiser. This made for a great ride on the street, although a little harsh at times, and drastically reduced nose dive under braking. For about $550 all in, it was a vast improvement
on the street. Off-road, I felt, and others who have done this swap agreed, the the 5100's lack sufficient rebound damping off-road which makes for a very bouncy ride in whoops. I also felt they blew through their travel way too fast on bigger hits off road and would bottom out way too easily.
I have now had the 6112's on my 4Runner for 12k miles, including a four off road weekend trips. On road, the 6112's feel a bit softer than the 5100's, but nothing drastic. It's sort of a, "Oh, that wasn't as hard a hit as I expected from that speed bump," type of thing. To me, as in this is my opinion only, the 6112's with their spring did not make enough of a difference over the 5100/FJ spring combo ON ROAD to justify the price difference.
OFF ROAD it's a whole 'nuther matter. I very much recall the first time I went off road with them (the weekend after they were installed). We were rolling down a trail and there was a tight 180* bend in the trail with some whoops in it. I didn't spot the whoops until it was too late to slow down as much as I wanted and I thought, "Oh damn, this is not going to be fun." I was amazed by how the 6112's just absorbed the hits while I tracked smoothly through the turn. If I had still had the 5100's, I would have absolutely bottomed out the front end and likely gone outside the turn into the bushes.
Keep in mind, this is a comparison between the FRONTS only, and between the 6112's with their springs and the 5100's paired with FJ cruiser springs.
Hope that helps explain the differences as I perceive them.