best tranny oil, type and brand, for 5kcstq?

[auditude at neta.com]

I've been experiencing the gears barely touching a bit when I shift, 
unless I deliberately place it into gear to prevent it.  I don't think it 
used to be that way.

I'm pretty sure I changed out the fluid and put Redline MT90 in it, 
which is a 75w90 GL-4 gear oil.  I thought it was low, so I was 
going to top it off.  It wasn't low, and in fact some dribbled out when 
I let the car down level on the wheels.

So, now I'm thinking this stuff is too slick or otherwise not the best 
thing I could be running in my car.

I was wondering what specifically people are running in their 
trannys, in similar 5kcstq's or T44's.

I will go back to conventional, if it means the shifting will go back to 
being smooth.  If it ever was, I can't remember.  It may be the 
shifter linkage needing adjustment or new bushings.  Are there any 
instructions anywhere on doing this, or perhaps rebuild kit part 
numbers?

Thanks,

Ken

p.s.  I got that cam pulled.  I took some digital pics, and the lobes 
are noticeable taller to my eye.  I don't have any calipers to give 
any hard data.  It was kinda nice, tearing into the motor like that.  
It's been a while.  Much easier the second time, but maybe that's 
because it's on an engine stand without the car around it.