John you said it right according to this link (nasty)
http://www.timskelton.com/lightning/...e_bushings.htm
[PHP]David said The arms actuality twist to make our rear suspension work.
IMHO the polly would limit articulation and put more stress on other parts./PHP]
I think this would be negligable from a street truck standpoint, the trailing arms are positoned at an angle as not to twist as much plus they sell strengthening plates as well, I will add larger front sway bar 1 13/16 , and a sway bar for the rear 3/4 to 1 inch. I`m not building a road racer just a better handling truck..