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Thread: Lighter springs on a 939?

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    4 Star General Buffalobwana's Avatar
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    Quote Originally Posted by snowtrac nome View Post
    if you want flex get rid of the short springs leave the longer ones in, generally spacers in the front aren't recommended I have seen some commercial rigs set up that way from the factory.
    The only reason I’d use chopped down springs as spacers, is to maintain ride height. Heat isn’t a springs best friend, but if it’s a shorty, used as a spacer, with no flex, Im guessing it would be fine.
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    I do not know which tire size you currently have on the 939 but is it possible to use a tire with a softer sidewall? Just wondering, if you do not plan on transporting heavy weights then maybe a little help in using the tires as a cushion may help.
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    I have got 16’s on the 923A2. Pretty stiff tire.

    But they sho do look good!
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    Just a thought, if your setting up the truck for overlanding, are you dead set on keeping the truck 3 axles? I had a buddy bob his truck and add a peterbilt rear air ride. That truck floated down the highway. Very nice ride and he was on 16R20s as well. It had a single leaf spring for controlling axle position and the air bags carried the weight. It flexed very well off road and I think it was rated at 21k or 22k load? The suspension was for a single rear axle box truck.
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    Quote Originally Posted by Lukes_deuce View Post
    Just a thought, if your setting up the truck for overlanding, are you dead set on keeping the truck 3 axles? I had a buddy bob his truck and add a peterbilt rear air ride. That truck floated down the highway. Very nice ride and he was on 16R20s as well. It had a single leaf spring for controlling axle position and the air bags carried the weight. It flexed very well off road and I think it was rated at 21k or 22k load? The suspension was for a single rear axle box truck.
    Yes, I have. You are right, that would solve a big chunk of the ride issue. And it’s a great idea, unless traction is paramount.

    I guess you should never say never to anything, but I’m opposed bc you are removing the benefits of another axle pushing an already heavy truck through sand or mud. You air down tires to gain traction which increases your footprint by how much? 15%? 20%? Three axles is 50% more grip than 2 axles. That’s substantial. The truck is heavier than most of its 4 wheeled adventure vehicle counterparts like the Mog or LMTVs. When they get up to this weight, most have 6 axles.

    I have thought about designs for airbags on the rear. It would limit articulation when aired up, but allow a fair amount of articulation when aired down.

    I saw Wes had a video about installing bags on the rear of a 939, so now I can’t take complete credit for the idea, although, my design varies from his.
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    The military actually made air ride rear 939's and profo has air bags up front. I am going all air ride with my XLWB 932A2. I am doing front, rear, cab, seats, and trailer already has rear air ride, and air ride king pin.

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    Quote Originally Posted by Csm Davis View Post
    The military actually made air ride rear 939's and profo has air bags up front. I am going all air ride with my XLWB 932A2. I am doing front, rear, cab, seats, and trailer already has rear air ride, and air ride king pin.
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    That sounds like something I need to see.

    Can the cab be put on bags in the back (with necessary modifications) using the front mounts to pivot off of? Do you have to raise the front of the cab a bit? I assume they have little shocks to dampen the bounce? Where do you get “kits” to air ride the cab? Or do you just piece it together?
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    Quote Originally Posted by Buffalobwana View Post
    That sounds like something I need to see.

    Can the cab be put on bags in the back (with necessary modifications) using the front mounts to pivot off of? Do you have to raise the front of the cab a bit? I assume they have little shocks to dampen the bounce? Where do you get “kits” to air ride the cab? Or do you just piece it together?
    I have looked at lots of over the road trucks and I believe that we can just graft the cab rear mounts and bags and shocks on to the rear of our cabs, but I don't know if the hood to cowl mating flange is going to need attention. I originally was going to be 4 dooring my tractor and it would have much less movement at the front than our day cabs will.

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