Mig or stick, is what I've done used for my driveshaft welds, flux core has so much spatter, unless your running thick wire, at 300 amps on 1/2 inch plate. Flux core has it's place, but welding thin steel at low amps isn't it's forte.
The first driveshaft I shortened when I was 16 YO , I oxy acetylene welded it, which is very similar to Tig welding, only it's done with a flame, as opposed to a arc, for the heat source. It held up in a 63 Tempest that I converted to a conventional driveline.
If you're not sure of your welding skills, you might be further ahead to shop for the right shaft, or farm the work out. I of course have no idea of what skills you have, but thought I'd make the suggestion, if you wanted to DIY.
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Brad Yost
1973 T/A (SOLD)
2005 GTO
1984 Grand Prix
100% Pontiacs in my driveway!!! What's in your driveway?
If you don't take some of the RACETRACK home with you, Ya got cheated 
  
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