I'm not surprised to see someone offering a lift with longer shocks. I just posted about the possible need for longer shocks on another thread - because I didn't know there was already a thread going on the Eibach suspension lift.
Here is most of that post:
Based on the Eibach website, they are offering a taller spring, but they are not offering different shocks with this lift. According to
@anand there will be no change to payload (unless you move from factory springs that have one spec for payload, to the taller springs that have a different spec), and no other modifications are required.
30 mm = 1.18 inches. But this still seems like it would take the shocks out of the "normal" zone that they were designed to run in. In other words: when the vehicle is unloaded ("resting position"), the shocks were designed to be extended by X amount. If you lift the truck by 1.2 inches, the resting position of the shock has been extended, and is now X + 1.2 inches, so you probably lose "droop" - which refers to the downtravel of the shock. Shocks need both uptravel and downtravel when off road. Without a longer shock, this lift might reduce articulation. In the photo below, the front left tire is demonstrating "downtravel", or "droop". The greater the downtravel, the better able you are to keep a tire in contact with the ground.
I'm also curious about their testing, and how this lift affects driving dynamics (mostly because the control arms are short, and - even with a small lift - when control arms are short, the angle of those arms is changed more dramatically). With just a 1.2 inch lift, this may be a non-issue. I would guess that the lift has been kept to a modest 1.2 inches, because that is the most you can lift the truck before the length of the control arms becomes a problem. The short length of the control arms is a significant obstacle to lifting a vehicle. Replacing short control arms with longer ones is a big deal, especially in a new vehicle. There are a lot of challenges, and lots of testing is needed. Even if they figure it out, it will cost $12,000-$15,000 to buy the kit (long arms, taller springs, taller shocks, other necessary hardware), and then most people will need someone to install it, because it requires cutting bracketry off of the frame, and welding new bracketry onto the frame (long arm kits are not bolt-on).
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UPDATE: It looks like Eibach has two offerings, but I think they are probably the same:
(1) From the
Eibach website: an Eibach lift that comes with four springs that are 30 mm taller - but no shocks. This lift looks to be around $1,000 AUS, or around $650 US.
(2) From the
Expedition HQ website: an Eibach lift that comes with four springs that are 35 mm taller, and four King shocks (presumably a little taller than the stock shocks) - $5,500 AUS, or $3,500 US.
It seems strange that Eibach is selling two different sets of springs, so I wonder if the difference is payload related, and maybe the 35 mm springs are the ones for a winch and a rear tow hitch, while the 30 mm ones are the ones spec'd for a Grenadier without a winch and tow hitch. I think these are the same springs - and they are just being described differently (after all, we are talking about a difference of 5 mm, which even an American can figure out isn't very much).
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