1991 100q difficulty shifting

[wadd-wadd at usa.net]

I have difficulty changing gears on my 100q, cold or warm. The car has ~201k
miles.

Once the shifter goes into a gear, the rest of the gear changes are silky
smooth.

If I allow 30 seconds to pass by in neutral, the same things happens again. 

The fluid has been changed with OEM fluid and is not low. 

Is there any type of an adjustment on this gear box? 

Thanks.