2nd &3rd Gear Not Going In While Changing Quick

[R33GOD]

ive had my r33 gtst gearbox rebuilt a little over 1 yr ago. was perfect. i do drive hard but up until a few days ago when i change quick it just chrunches and dosent wanna go in. it dosent happen all the time

clutch is new by the way. oil was replaced 3 months ago too, to full synthetic.

i did have a problem 2 months ago when my pivot on the end of my shifter went through the gearbox. it was fine still. tuner said not to worry about it as its nylon/plastic. now im havin some problems under quick changes...

what could be wrong?

thanks

[Simmo1985]

My friend used to have this problem occasionally in his 180sx (SR20).

Sounds like a synchro problem.

[Duncan]

what he said. try some redline lightweight gearbox oil, or change gears slower.

could also be your clutch is not disengaging properly because it is wearing out or is not adjusted properly.