Never used a jig on all the ones I have done.If you take your time,let it cool and do it in quarters it comes out fine.I can see it warping if someone would weld continuously non-stop.In your question you are referring to just welding the center section to the axle tubes,correct?
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1964 Impala 468BBC,T350 transbrake,4.30 9",10 point and 10.5 M/T's
1996 F250 4X4 12V Cummins,compound turbo 63mm over 75mm,cam,520cc pump,full billet 4R100 563hp&936ft.lbs w/a bad fuel pump and on a dynojet...just an old hunting truck 
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