I needed to put tractor in high gear and could not get it to shift over. I finally sprayed the linkage close to where it passes into the transmission case and then used a wrench to leverage it . It has shifted fine since doing this. Since the tractor has seldom been put in road gear would it be safe to assume that this issue was outside the transmission housing and not due to internal wear but most likely " frozen up " at the shift linkage outside the case due to not being used much. I assume the little ball joint linkage could hang up if not shifted more than a few times every decade or so?