Lower tire pressures?
Lower tire pressures?
BrokenYugo wrote: Lower tire pressures?
Cant with the 19.5's no safety bead. 70PSI is minimum
I've seen people convert their normal pickups to run 19.5s, can you do the reverse? Like drop to a 17 or something? Full disclosure: I know very little about medium duty trucks.
In reply to thatsnowinnebago:
Yes basically, but it needs to be more like 20x11... Super deep offset, made for the high load, and not cheap... I can run a E range ~4200lb load rating. I need to get weighed.
I think the Kelderman air bag perch is the best route from my research. You can get height, adjustable ride and soften the blows to the whole truck.
Have you weighed the truck? What is the GVWR of the truck compared to how heavy it will actually be when completed? You might have some leeway to lower the spring rates a bit for a more compliant ride.
what about airlift helper bags? They did wonders for my rv, and they're pretty affordable. air lift
In reply to Petrolburner:
Yeah it seems to be what all the "big of road RV" companies use, along with their lined rear end....
In reply to Ian F:
Not yet, I was trying to get cabinets, water etc done first as those will add a fair bit more weight. Im guessing 14-16k ish. GVWR is 16k, payload is 7490. The rear end feels fine to me, its just the front. I need to get axle weights to see whats up.
In reply to grover:
Have them in the rear already, running 45psi ish. Seems nice, I dont touch the overload springs at all that way.
There also isnt much up travel in the front... About 2-2.5" Bump stop feels very soft though.
I did get the last big interior panel on though!
I just have to say you are doing an amazing job with this.
It's giving me a whole different perspective on a box truck/hauler/mini rv idea!!
In reply to NGTD:
Thank you! I have had this bad idea in my head for a few years, luckily my wife is a very understanding lady! 
I'm running 90 in the rear on mine I believe, do you have them in the front as well? Your truck is so much newer i'm not sure my experience relates in any way. it's looking great though!
In reply to grover:
Thats a bunch! I just put enough in to keep the overloads ~2" off their perches. They weren't touching before the bags though. Nope its coil springs in the front.
my bags inside the front springs made the most difference in ride, which is weird, but they did. I've got a pretty heavy rig so 90 helps.
In reply to grover:
Hmm, Those are cheap...
But I really feel like its too stiff, the front felt like it just absolutely dropped off into the holes.
My thinking is possibly: front axle drops as tire drops into hole, then I hit bump stops as the cab follows. But it was just so abrupt. Slowing down to let things roll in and out of the holes was fine.
I wonder how much of a difference shocks would make there. I think they are the OE ones with 107k on them, the rears completely collapsed by hand when I pulled them, Im guessing the fronts aren't far behind. Maybe it would help control that "drop" into the hole?
That's exactly what was happening on my rig, also the sway when trucks went by was fairly dramatic. This absolutely changed the way that it drives (I just did 8 hours round trip in it) and the way it rides. For $100 for the fronts it's hard to beat. Putting them in was a huge pain until I figured out the method.
In reply to grover:
Hmm, I feel like its too stiff though, and those would only increase spring rate.
coud be. Mine was floating after bumps so it was obvious that it needed something. Like I said, your's is much newer. Stoked to see what you figure out though.
If the problem is the suspension bottoming out hard you either need more spring or more travel. Shocks would probably help.
In reply to BrokenYugo:
Not sure if that is the issue. I will grease the bump stops next time. I dont doubt is entirely possible though
What you need is more travel I think. Either new springs, longer and progressive, or the Kelderman solution. Maybe just a spacer to keep you up off the bump stops. I had the same problem with my van. Once I actually had some usable travel, plus the better springs and shocks, it was night and day different.
In reply to Petrolburner:
Yeah we are taking it out Friday, I will see if I can rig up the go pro or at least grease the stops.
No one makes springs for 450's. Options are spacer under the lower spring perch (ready lift makes these) or kelderman.
In reply to java230:
You might be able to call Deaver or someone for custom springs. Not sure if they do coils though...
if you have the spring specs you could probably call hyperco or any of the spring manufacturers and get them.
Im betting custom springs will be more than the air bags. They are $1400 with fill fittings and shocks. Not too bad really.
Ill see what I can see on Friday, maybe my wife can drive and I can watch things move.
Found a few hours yesterday between soccer practice, dinner and homework with the kid....
Propane tank mud flap is done, man are those things hard to cut!
Bolted to the body on the outside
and a piece of cable on the inside. Hopefully this keeps it off the tire. Handy slot/hole was already in the spring hanger, I think it will stay put.
Finished up the last big wall panel, still lots of trim work, and skinning the door. But this piece keeps the insulation in place and give it a much more complete feel.
Caulked in the back side, this is kinda a "wet room" skis, ez up sleds etc. That should keep the water from running under the floor into the living space. There is a fair bit of storage back there, but I wish I had made it 1" deeper....
Got the inverter mounted, and the hot side cable done. Man everything takes FOREVER! Climb under bed, forget some little piece/tool, climb out, walk to garage, climb back under bed. Repeat ad nauseum.
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