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Old 04-21-2013, 08:48 AM   #1
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HDT conversion on spring ride vs air ride

A few years back I built me a haul truck from a semitractor but sold it since I wasn't using it a lot. Now I'm wishing I still had it. I built it on a raised roof Volvo (cheap), with a small block Detroit (cheap), Super 10 (cheap) with air ride, tilt, cruise and jakes.

I'm back looking for another right priced truck to convert and while I'd ideally want an air ride again, I wonder what it would take to convert a 4 spring setup from twin screw to single screw if I come across one thats just a great deal. Doing the air ride was a simple job of removing unwanted suspension and drivetrain components and reattching what you kept in its new location. Has anyone on here dropped an axle on a springer using whats there without having to go to the salvage and gather parts and redo everything?
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Old 04-30-2013, 08:38 AM   #2
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Lots of singling is being done on semis these days, Volvos being the "preferred truck" because of its suspension and the ease of moving the axles.
When singled short, the rears are simply rebolted in the front axle location using the same bolt pattern. Mine was done like that. What has emerged however, is the mid mounting, where the rears are mounted in the center location between the original tandems. That requires drilling 32 new holes in the frames but it produces a very well balanced truck from the weight point of view and the visual point of view. Mid mounting also "preps" the truck well for carrying a Smart sideways behind the cab and in front of the fifth.

The singling that I am talking about is done on the air suspended trucks, I am not aware of anyone doing what you suggest as it raises the question "why"?
There are so many trucks out there "priced right" with air suspension to do it, why tackle the additional challenge. I don't think that it could be done unless you obtain additional parts either new or from a "donor truck".

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Old 06-23-2013, 03:33 AM   #3
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sorry i am so late to this thread
I bought the axle right behind this one (for $125) for my F-700 Ford To convert it to air ride.


Drilling the frame was quite easy although it took a most of a day.
I simply took the frame rails and clamped them on to the opposing side frame rail and used them as a pattern. I then took the pilot bit out of a hole saw bit and drilled away. I did have to do some "adjustments" to get the pinion angle correct.
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