michael what do call a real auto house
Either a dedicated automotive electrical components supplier who does in-house rebuilding, or any independent parts jobber.
It's simply not worth the time and effort to attempt a starter reconditioning, most especially if the armature took a dump (or a field coil), though that is extremely rare.
It takes some experience and skill to properly exchange the starter drive, the starter solenoid, clean and lubricate the internals, and replace the brushes. Those are delco starters, no more common component on the planet. There are two different nose lengths used by IH though, your application May or May not use a spacer between the starter nose and the block seat.
Far more common on an autotrans rig is a neutral start switch (nss) issue, a neutral start switch relay issue, a nss pigtail/connection issue at the nss switch on the transmission, a bulkhead connector issue, a starter solenoid connection issue, a poor ground issue, a battery cable/connection issue at the battery, etc.
Have you tried simply holding the shift lever up against it's "park" stop and then hitting the key switch?? Have you tried to start with the shift lever in the "neutral" position?