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Old 01-22-2020, 11:15 PM   #1
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Grafting two shorties together?

Hi all, just joined with the intent to get some of the planning questions I had squared away.

I primarily want a shortie for maintenance reasons, with the powerplant being commercial rather than industrial I can theoretically take my build to any shop.

That being said, I wanted to know if it was feasible to buy two buses, and cut them up with the intent of turning a 5-window, two-axle shortbus into a 9-window, three-axle shortbus. This would be achieved by extending the chassis aft a few feet, then adding in the entire rear portion of a sort of sacrificial loaner bus, effectively stretching the whole thing out. Some concerns I have right away are with regards to welding the chassis of the bus, after all, that holds the whole thing together. What are your thoughts? Am I chasing a technical pipe dream that'd be completely unfeasible, or am I onto something?
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Old 01-22-2020, 11:39 PM   #2
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My first thought is "why?" Full length and mid length buses are readily available, and frame welding is no trivial matter. Better to find a mid-length bus, or even a full length one and chop it down in length. As for the tandem axles, better to swap a pair from a road tractor than try to adapt from 2 buses - you'll end up with a properly engineered "twin screw" rather than one axle being unpowered, or trying to reinvent the wheel powering that 2nd axle. (And to that end, there was another thread that addressed this tandem axle conversion, basically the general consensus being that unless there was a specific need for the greater weight carrying capacity, there was not really any benefit to this).
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Old 01-23-2020, 04:12 AM   #3
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Admittedly I am not seeing the point. Just buy a bigger bus? As Brad said, it would be easier to add a tandem axle set to a full size bus than weld together two short buses and make everything work. Can you help us understand why two short buses and not a mid-to-full-size bus?
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Old 01-23-2020, 02:48 PM   #4
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I also don't see the intended purpose being feasible. A shop that would have worked on your engine would likely take a look at the Frankenstein 3 axel bus and make a judgement call to not work on it...

YMMV
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Old 01-23-2020, 04:05 PM   #5
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and if a shop can and is willing and capable to work on a short bus engine/drivetrain then they should be fine with a medium size bus.
taking an axle out of one bus and adding it to another only adds to weight carrying capacity and doesnt make it an dual tandem axle.
i have looked into adding a tandem axle from a dump truck more for me because i have the access to several of them just out of service and would get to upgrade from tubed rims.
but the spring packs are double what is already a rough ride with a single medium duty axle and for my bus the spring perches dont match the frame width so some fabwork for that and then the wheel base is wider.
not scared of any of it but for me is alot of effort/time just to upgrade to more modern rims and i would have a bus that would have to be heavily loaded all the time to take the jarring out of the heavy rear suspension.
you can take springs out of the spring pack but if you pull to many then you have to find new u-bolts,pack clips and so on.
BUT THATS THE NATURE OF THE BEAST when you want to modify something.
good luck
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Old 01-23-2020, 05:17 PM   #6
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Like this maybe?
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Old 01-23-2020, 05:56 PM   #7
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Like this maybe?
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Old 01-23-2020, 10:42 PM   #8
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