[drew300]

I don't know if this will help, but a while back I blew a shift into 2nd. I wasn't racing, just shifting thru an intersection. Then I noticed that the shifter was very stiff moving. Everything worked, so I was careful on the way home. I sprayed white lithium grease where the shifter cables meet the bits that change gears at the transmission, and worked it around by shifting gears. (engine off)
After a short while, it freed up and has been good ever since.
I'm thinking perhaps the heavy rain that may have had something to do with the fault.
I just thought, since you bought it used, maybe check that it's got the right oil in it. My manual shift calls for automatic transmission fluid, not the old standard 90 weight.