PS- may or may not end up throwing a Kelderman rear air suspension kit on it...
So, this is happening.
Perhaps a little explanation on "why" is in order. Ever since the SAS, my rear suspension config has been a bit of a mess. When we did the SAS we did a Deaver "mini-pack" in the rear. The mini-pack replaces some of the factory leaves but not the entire pack. It ended up not providing enough lift, so I removed the 1" block that had been in since the 4" IFS lift and went to a 3" block. It got it sitting about perfect with the camper off, but the camper (which is only 1100lbs dry, it does hold 26gal of water and a good bit of kit, but I still can't imagine it is more than 1500lbs fully loaded) it sagged enough to need ~60psi in the bags to level out. In a past life I towed ~17k lbs 5th wheels with ~3500lbs of tongue weight and only needed 60-80lbs in the bags, so clearly the Deaver mini-pack setup is just too soft for my rig. On top of that, I think the axle isn't perfectly square with the stack-up of tolerances between the stock leaves, the Deaver leaves, the lift block etc. Only the driver's side tire catches the bed side at the front of the wheel opening, the passenger side does not. Finally, I think the driver's side spring pack is beginning to breakdown, I've found I need to run 80psi+ in the driver's side bag with 60psi in the passenger for it to sit level, that was *not* the case initially.
All of this had me ready to order some custom leaf springs. But even that wasn't especially clear. It's hard to say just how much "lift" I actually have between the block, the Deaver setup (which is said to be 1.75" of lift, but I don't think it manifested as any lift on my truck), manipulating ride with the bags etc. I would also need to decide how much extra load to specify in the order. Would I do +1500lbs for the camper... but then have a rough ride and stink-bug look without it? Would I do stock and compensate for the camper with the bags as I had been doing (which has the advantage of allowing me to park nose-low at camp then let the air out of the bags to level out while making the step up into the camper easier)? All-in-all I wasn't really sure what to do for springs.
Two other things, I definitely wanted a better, adjustable shock to dial-in damping for the terrain, camper or no camper, etc. and I wanted to add a sway bar (my truck didn't have a rear sway stock). There are bolt-on aftermarket solutions of the style where the sway bar is on the axle, but the "arms" and end links go forward and would interfere with my aftermarket fuel tank and skid on the driver's side. I wasn't willing to give up the fuel tank, as range is one of my favorite things about this rig. I was looking into fabbing something more like my WJ where the sway bar is chassis-mounted behind the axle, with the arms going forward and the end links connecting down to the axle.
So, with alllllllllllllllllllllll of this the Kelderman just made sense, the cost isn't that different than custom leaves and sway bar fab, and there are just so many benefits:
- The 4-link setup will allow dialing in axle position perfectly
- Going to 100% air with auto-leveling solves all the questions about spring rates and/or lift amount - it takes care of itself (after setting the initial ride height at level without the camper)
- With the manual over-ride of the auto-leveling I can still park nose-low and drop the tail, or use the bags to level left to right at camp
- With as much travel as the Kelderman system has I can actually use it to help with loading/unloading the camper
- The Kelderman kit adds a sway bar, in exactly the manner I had thought of
Some pics of the Kelderman kit (mine will be powder coated a textured black):
-TJ