Matt, It sounds to me like the original problem was a stuck pilot spool as you determined. Unfortunately , running the unit at all with a pilot spool stuck does major damage to the stuck clutch as it is forced to slip while the other two needed for the range involved are engaged. Actually, the clutch with the most grip will force the other to slip. When you had the original getting into gear problem if you had stopped at that time and correceted the problem without going out and plowing 25 acres we probably wouldn't be having this conversation. When this happens I always recommend a complete removal and cleaning of the PS control valve as foreign material has the pilot spool lands contaminated.
That being said, the steering is an issue that you need to repair as the steering return flow sets up a 75 lb working pressure which can be checked at the "lube" pressure port on the PS control valve cover. The steering is a seperate pump bolted to the face of the main pump and is a simple gear pump which supplies both brake and steering flow. It also controls the position of the reverse lockout spool which has lands which control PS clutch flows so improper reverse lockout spool function can make shifting look bad. It can be diagnosed by a flo test.
I would highly recommend a complete flo test on the whole hydraulic system as that can be used to verify clutch leakage to pin point or damaged clutches.
If I were to make an educated guess based on your early comments I would say that a major rear split is in your future as I believe you have shiting clutch damage at this point.
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