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I now drive a 2003 S-10 Had an 03 LX 3.5 Sorento
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The joint is there because of support. A one piece shaft if too long will cause a vibration because the middle is not strong enough to withstand centrifugal force. If the shaft is made of a larger diameter, stiffer material you can achieve a succesfull conversion. A question I would have is, who makes it, what diameter is the tube, and what kind of warranty does it come with? A carrier bearing is only $89 if you do it yourself. I have had mine replaced at 56,000(under warranty and then at 101,000). At that rate the driveshaft might pay for itself in a few replacements. What quality u-joints are they using and can you get replacements? I am not discouraging you in anyway but just tossing out some food for thought.
 

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The joint is there because of support. A one piece shaft if too long will cause a vibration because the middle is not strong enough to withstand centrifugal force. If the shaft is made of a larger diameter, stiffer material you can achieve a succesfull conversion. A question I would have is, who makes it, what diameter is the tube, and what kind of warranty does it come with? A carrier bearing is only $89 if you do it yourself. I have had mine replaced at 56,000(under warranty and then at 101,000). At that rate the driveshaft might pay for itself in a few replacements. What quality u-joints are they using and can you get replacements? I am not discouraging you in anyway but just tossing out some food for thought.
Thanks for the input, I offered 300 on it and see if he takes it. Its worth a try.
 
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