I just did the detent springs in my Massey MF12 rearend and dad's Bolens 800 needs them. If the one shift rod for the other side moves at all you can't get it out of gear. The detents on both shift rods are not working. I would love to fix it before this coming weekend so it works for him at the plow day. I could swap the whole tranny with one of the spares but I don't know if they are identical.