What exactly causes 2nd gear lockout...?

[Chris@Rvengeperformance]

Good poly mounts. Why?

Well it doesn't sound like it in your case, but if your motor mounts are bad enough the trans can move enough to effect the shifter cables and make you miss gears.

[nodoze]

I have seen shifter cables become unbolted from the trans and cause a gear blocking.issue due to slop

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[75blackray]

Good points to double check along with the clutch adjustment. When I finally get the time/nerve, I'm going to pull the trans again (stupid os seal!), and check the internals again as well as the clutch and pp. My only problem is at that point do I want to really spend $600+ on a clutch, when the current one is holding strong (if its not the cause of 2nd gear lockout), and has <15k miles.