Although I have never used them, the benefit is allow more adjustment for alignment. Older frames have a tendency to twist over many miles not giving you enough latitude to get the alignment within specs. The offset shaft moves the pivot center on the upper A frame without having to resort to pulling the frame to get it back to the original factory specs.
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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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