Is there any differences between NBS and OBS Torsion bars, particularly 2500HD Bars?
That is incorrect. Its the tb indexing on the 2500 lower control arms that make the difference. Not the tbars. Both bars are the same other than their load ratings.you need to use your half ton keys with those bars, they are indexed differently. using half ton keys on 3/4 ton bars is like ford keys on the half tons. and yeah, i need to do the same, I just installed a ranch hand and i need some more beef under the front.