So the LS 460 L is out of the question then, I would settle for the LS430, but if it won't go like the 400 then it won't go like the 430. What models of that brand would I need to look at and what specs if I was comparing brands, should I look at in order to choose between different brands and models?

 

I installed the air-lift super-duty bags on the rear & it helps dampen the bounce at around 18 to22psi empty. but when loaded is when they really shine.

 

......

 

Just comparing the ride of the truck with the lexus sedans. That's all.

 

You can play with the shocks, air pressure, even put air bags on your truck, but the bottom line is you drive a truck. It's always going to ride like a truck. The only way to change that is to take away the very things that make it a truck. Install softer tires, springs and shocks and maybe it'll ride great, but you won't be able to handle a load.

Maybe if you install an air ride seat you'll be a little more comfortable?

 

you can let pressure on rear tire down to about 50lbs but front tire got to stay around 85lbs if it's diesel

 

I understand that I can only go so far, but I also understand that automative companies don't necessarily put the best products on their vehicles, knowing that I was hoping there would be a way to eck out whatever I could without a sacrifice.

 

in reality air ride on rear would give smoothest ride think front has enough weight on it to keep it pretty smooth

 

Ford doesn't use what's "good" in suspension. Ford uses what's "cheap."

If you want to spend the money, you can make it ride better. How smooth can you afford?

-blaine

 

I have a 4x4 crew cab dually and here's what I did to improve the ride. I carry a very large truck camper, so I added airbags to help support the extra weight. The airbags allow me to adjust the ride height on the rear when the camper is loaded. With a minimal 5-10 psi in them when the truck is unloaded, they don't seem to affect the ride at all.

I also added Rancho RS9000 adjustable shocks. They are totally awesome because they allow a smoother than stock shock ride, yet the dampening can be cranked up for camper hauling so that the dreaded camper sway can be controlled.

The easiest thing you can do for a smoother ride is to lower your tire air pressure. I only run 35psi in my rear tire when unloaded and even that is too much pressure because the center of the tires are wearing out quickly. The key to running lower pressure is to make sure and add enough air to support any load you put in the truck. I have to air up to 55-60 before I load my camper. BTW, I didn't just pull those numbers out of nowhere. I have the tire inflation chart for my tires and I've weighed the truck (by axle) with and without the camper loaded. Then it's a simple matter to set the pressures based on the chart.

 

The Air-Lift Road Tamers ( http://www.airliftcompany.com/road_tamer.html )will do exactly what you are after, but they are expensive. I am considering them for the 08 450 I will be ordering soon. I downloaded the installation manual and I think it is too difficult for me. They suggest 6 - 8 hours by a professional mechanic.

 

Velvet Ride replacement shackles would help, but I don't think that they're available any more.

 

Maybe a set of these rubber springs would help.

https://www.sulastic.com/