Notes: Under 8,500lb GVW; Dual Outlet; If welded Assy, replace all Reqd parts; Up to 8500 G.V.W.R; Optional; HD for 18239;Under 8,500lb GVW; Dual Outlet; If welded Assy, replace all Reqd parts; Up to 8500 G.V.W.R.;If welded Assy, replace all Reqd parts; Optional; HD for 22460