You can pretty much fix the starter yourself,if it is the non gear reduction/old style.
The soliod on the old style starters can be taken apart carefully,cleaned and broken parts replaced.But you need replacement parts,which most old style GM starters can provide.
I have not been inside a new style one yet.
90 Chev 3500 c/c 4x4,6.2na,400 auto,4:10 gears.DSG Timing gears,main girdle, isspro tach, pyro,boost,oil and trany temp.Dual Tstats, High volume peninsular pump,on shelf, Custom turbo and intercooler 85%complete. Change of plans for the dually, it's going to get a Cummins. Both trucks are Blue 90 4x4 crews