figured id update this. my friend ordered his with damper and i ordered mine without damper. both our trucks are 90. i installed his first and his was jsut on the verge of too long. i think i cut like 10" off his shaft to make it fit. even then however the inner portion of the shaft almost protruded through. i was unable to drill the hole for one of the long set screws because of it. between his redhead box, borg shaft and new Motorcraft tie rods, his truck has zero slop. mine installed great. had to cut off like 8" or something and drill 1 hole for one of the long set screws. i do love how much of a difference it makes, i have a reman 4-bolt box i questioned how worn it was but with the borg shaft i have no slop and nolonger need to worry about having the 4-bolt sent into redhead.
very happy overall. i got my shaft from Amazon on Prime next day. he got his i think from JBG because it was not on Amazon