Anyone Experience this??, Manual Tranny Shifting Problem Options

[Fastbird]

This is probably going to be for the forced induction guys more than anyone, but here's my issue:

I CANNOT hit a hard shift into 2nd at WOT in the car. Simply put, the tranny refuses to go into 2nd gear, and third gear offers quite a bit of resistance at high throttle inputs also. When driving easily however, it shifts fine into any gear I want it to.

Call me crazy but I've always had trouble shifting cable actuated manual transmission under heavy loads. What I think is happening is that my old/weak motor mounts are allowing enough movement in the motor that enough of a shift happens to throw off the sync of the cables to the shifter. What I'm trying to do is get some verification on this.

Thoughts? I must have tried 4-5 times last night on the way home from work to bang a high RPM WOT 1-2 shift and it wouldn't happen.

[808celica]

try this too:
-grab a 2nd person
-have a 2nd thats hold the stick in the gear that's always mushy
-it shouldn't go into gear and have the feeling of "emptyness"
-you go in the bay and pushing the gear selector (the upper one, not the one thats on an L arm) towards the trans mount
-your 2nd should notice the feeling of the stick entering 2nd gear

-your 2nd should be able to push it into neutral
-then have him/her put the stick in neutral again
-if there's still the mushy empty feel the yes we have the same problem

*ehem waiting for my cables