B6s are probably too firm for stock springs but certainly usable if in spec for the spring length. I'd go B4 and they will be much better than stock due to better rebound damping which is the real problem with the stock ones, especially if I was keeping the stock springs.
Owner reviews for shock absorbers
Here’s what I’m doing about it; Spec 30 setup. H&R sport springs and Bilstein struts/shocks.
From what Ive read bilstein 51xx series are the best all arounders and cheaper than OME, but ome does slightly better in ride quality- at double or triple the price.
I know they are in a little different class, but my Jeep has never been as comfortable as it is now that it's on FOX remote reservoir shocks. The off-road performance is great too.
Put a set on this year and was amazed with how much they smooth out the small chatter while still being composed and stiff through corners. I thought my tires were low on air. That’s how much more composed it was through imperfections and bumps/pot holes.
I put bilsteins on my 2000 Tahoe and was very impressed with the improvements.
That is one reason we put disc brakes all around and lowered the CG of the main mass and installed KYB gas shocks, etc.
These rode very well for smooth roads and could absorb minor shocks very well and handled like a dream. The rears are tuned pretty stiff, but not too bad from the driver's side of things. The passengers wouldn't like it too much, but still it's more stiff than harsh.
I had a 2009. I replaced the rear shocks, they were gone by 50K.
I put these Rancho RS9000XL Shocks on in 2018 on my 2007 Xterra. I've only put about 20K miles on since. Very disappointed in both the quality and the soft ride they provided. I put on Bilstein 5100s, so far they feel much better.
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