question about 9 inch setup

[linemup79]

im puting in a 9 inch in my elcamino, just woundering if adjustable upper or lowers arm would work better to adjust traction?

 

[406Elcamino]

i used solid lowers ( iceman ) but i used DM products adj uppers and it was a must to get the correct pinion angle but yes they can help with traction when tuned