Tim:
This sounds like a case of dragging clutch. I had the hard shifting also and
changed to Redline oil, but the problem persisted. I ended up putting in a
new clutch slave cylinder and it fixed it.
My problem was also happening "after the oil warmed up" but in reality it
may be the rubber seal in the clutch cylinder that is the culprit. As it
warms up and expands it then grabs and does not release the clutch fully.
One more thing, as this happens it is VERY bad for your synchros of
transmission, it causes them to wear fast from the pressure of synchronizing
gear RPM's in your tranny. Fix it soon no matter what it is.

Rachel http://www.gnarlodious.com

Entity Tim Fong spoke thus:

List,

After driving for about a hour or so, I'm having difficulty getting my
transmission into first gear and to a lesser extent second gear.  Recently
changed to Redline lubricants and was no help, this condition existed prior
to changing fluids.  This condition does not exist at start-up.  Thought it
might be the linkage needed greasing, but shifts fine into 3rd and 4th.
Time for a transmission rebuild at 80k mileage, replace the synchros on
first and second gears?  Thanks in advance.

Tim
'87 Syncro Westy "Trigger"