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I am not sure what model they are since they are the only air shocks that napa had for my truck. You only need to do the rears. The install like regular shocks except I had to make a bracket to bolt them to the upper shock mount. Plumb up the air lines and fill em with air just like filling a tire.
where do the air lines plumb to? can you easily get at them once it's all installed? do you run the hoses to the bumper or something? Have you had any issues with the rear leafs as far as sag, or the shackles? mine look like they are ready to fail at anytime (the mounting brackets)
The air lines run from the air shocks to the fill valve which I mounted on the plastic between the bumper and the body of the truck. All I have to do is open the gate to get to the fill valve. I will take pictures tomorrow of how I installed them.
As far as the leaf springs go, I have noticed that they are starting to sag now that the truck is getting old but I have't really looked at the shackles. I'll look tomorrow when I take the pictures.
Do these help with handling, regardless if you are towing something? I would think the firmer they are pumped up, the better it handles, but the ride is stiffer...
Can you overfill them? or do they auto cap at 120 psi or something?
They definately feel better than what was on there. The old ones were toast. The ride is stiffer when they are aired up more and the truck sits a little higher. The truck definately feels better when hauling stuff when they are aired up. If they are too high though, the truck feels squirrely. I usually keep them aired up to whatever makes the truck sit level on flat ground. IIRC its around 40psi but I don't really remember.
They say that the shocks can handle 150psi when the vehicle is full loaded however extended operation above 90psi will wear out the shock faster. As far as overfilling them goes, my compressor only goes to 135psi so thats about all the higher I can go. Like I said though, I usually keep them around 40psi and it doesn't take much air at all to get to that point.