[Fot] TR-4/6 trans top cover advice (won't go into 3rd gear)

[Tony Drews]

At my last race, I felt entry to 3rd gear have some resistance, then the 
resistance went away, but near the end of the weekend something happened 
that prevents me from shifting into 3rd gear. I can shift into all of 
the other gears just fine.  Didn't feel like a internal gearbox issue (I 
certainly hope not, I just replaced all the quaiffe goodies in there).  
I've never taken the top cover apart / had to fix that.  It does still 
have the overdrive switches in the top of it even though I'm no longer 
running the OD.

So... I'm planning to remove the tranny top cover this weekend and see 
what's going on.  I probably have a spare from an unknown quantity 
transmission from my Dad's stash, but I'd like to fix the existing one 
if possible.  For those who have done it, how fiddly of a job is it to 
take that stuff apart?  Any ideas what would keep it from shifting to 
3rd?  I have noticed increased resistance on the 3/4 shift rail since my 
rebuild earlier this year (but didn't have time to look into it at the 
time).

Looking for words of wisdom from those who have been there / done that.

In other news I have some pretty epic videos from last weekend's race at 
Grattan coming.  Here's a appetizer from the "Genius Garage 
Invitational": https://www.youtube.com/watch?v=_LWlZIFA_gg

All the best, Tony Drews