R5 shift stick stuck and steering linkage info

Just got an R5 and the shift stick is stuck in neutral, I presume it is rusted, can't wiggle it in any direction. Anyone have a diagram or schematic of it? Has a shift tower as in picture.
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Also need info on steering clutch linkage, one lever has no resistance and the other is almost to the seat before feeling any resistance.

A top mounted shifter like that one is a relatively simple thing. Hopefully once you unbolt it and lift it off the top of the transmission, you will find the "ball" on the stick is simply rusted solid in its socket and the shift rails below are in much better shape.

The steering clutch symptoms point to the clutch packs being swollen with rust, one worse than the other. I expect you are looking at a teardown and replacement to fix them vs any sort of soak and shock process of unsticking them. A quick look inside the steering clutches should tell the tale. Have someone move the levers and determine which parts of the linkage are moving/movable.

Seems like I remember the D4 has some bushings on the steering cranks in the upper part of the cases that tend to seize because of moisture and condensation. I thought the "5" was basically a D4 chasis?

The R5 is like a 35,40,RD6 on the chassis.