The solenoid pushes. It pushes a pawl, which is a 3/4 by 3/4 inch slug of hardened steel, with a bevel on one end, into a notched wheel to stop it. The end engaged by the solenoid has an external groove on one side, and a cross hole with a slot. The solenoid has a ball end on its plunger, with two flats, and you can rotate the solenoid about a quarter turn, to either engage it in the pawl, or withdraw it. The overdrive shift rail passes under the above-mentioned groove in the pawl, and if a a milled flat on the shift rail lines up with the groove on the pawl, the solenoid is free to push the pawl in. Should even the tiniest part of the full diameter of the shift rail line up with the pawl, it is blocked from moving.
You could undo the bolts retaining the solenoid, turn it about 1/4 turn to the left, and remove it. Then place a flat-blade screwdriver in the slot in the pawl, and twist it firmly. That will give you a grip on the solenoid, and you should be able to push it in, and pull it out. It should move at least a half-inch. And you can observe the effect of the OD shift rail.
You could undo the bolts retaining the solenoid, turn it about 1/4 turn to the left, and remove it. Then place a flat-blade screwdriver in the slot in the pawl, and twist it firmly. That will give you a grip on the solenoid, and you should be able to push it in, and pull it out. It should move at least a half-inch. And you can observe the effect of the OD shift rail.
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