093 manual tranny sticking

[ejfluhr@austin.ibm.com (Fluhr)]

What could cause a manual tranny to be extremely difficult to engage?

My transmission is having problems.  Sometimes I cannot engage it in any
gear easily, I have to apply a lot of pressure in 3rd, 4th, or 5th to
get it in.  Once it goes in, however, it will shift into any gear 
as long as I keep the clutch in (so I think the shift linkage bushings 
are ok).  It only gets stuck at very low speeds, or when at a stop, and is
intermittent.   Regardless of this, whenever I try to shift, the
transmission feels "wrong".  It feels like the synchros do not quite do
their jobs, or are fighting the shift.

Several months back, I replace the tranny oil with Valvoline synthetic
75w90, from Pep Boys.  I checked it while I was having clutch problems
a few weeks back, and it was ~1/2 bottle low (how much is a bottle,
two quarts?).  Topping it off had no effect, and it seems to be getting
worse with time.  The clutch engages and disengages perfectly (as it
should after new slave & master cylinders).  

Help?

Thanks,
Eric
'85 Coupe GT, not wanting to cooperate
---
Eric J. Fluhr                                Email:  ejfluhr@austin.ibm.com
630FP Logic/Circuit Design                   Phone:  (512) 838-7589
IBM Microelectronics Div.                    Austin, TX