Virtually all shanks have 3/4 holes spaced 1ยผ inch apart. Most hitch heads attach using two holes with one unused in between. Some of the Reese hitch heads attach to the shank with two holes and two unused in between (not sure how else to describe it). I discovered this when I was looking for shims to use on my Blue Ox Sway Pro to keep from crushing the mounting ears in toward the shank. (either the shank is a little narrow, or the ears on the hitch head are a little wide (both were Blue Ox parts). In any case, I ended up with Reese Pro Series shim p/n
PS58444 which has 2ยฝ inch hole centers and worked well on the Blue Ox just fine (0.042 thick). I also discovered the
Reese 58207 that has 3-3/4 inch hole centers which is somewhat unusual. The Blue Ox and Equalizer have the 2ยฝ hole spacing.
To make a long story short, the shanks are pretty universal, the differences being how many vertical holes they have (rise or drop), how long the shank is from the receiver pin to the vertical row of holes (8 to 12 or so inches), and the size of the receiver portion of the shank (2 inch or 2ยฝ inch).
Charles
'03 Ram 2500 CTD, 5.9HO six speed, PacBrake Exh Brake, std cab, long bed, Leer top and 2008 Bigfoot 25B21RB.. previously (both gone) 2008 Thor/Dutchman Freedom Spirit 180 & 2007 Winnebago View 23H Motorhome.
