by geeves » Wed Oct 28, 2015 9:52 am
Diff drop isnt suspension or steering so if you can get away without modifying the cross member it shouldnt need cert although a ball joint flip is a suspension mod that should be certed so if your wof guy sees it (he wont) he will send you to the certifier
As soon as you touch the cross member its a chassis mod even though that cross member is bolted on.
I have a spare cross member at home if you need it
Sanding your knuckles before starting work can help. That way you cant skin them