I only road race my car and trailor it to the tracks.

I have a hydro GSR transmission with a Mfactory 4.928:1 FD and a Spoon 1.5way lsd.

When racing, if I go 4-3-2 while bleeping the gas I get my second gear everytime but if I go 3rd down to 2nd, after 3laps or so, my 2nd gear is like a wall and not there???

It does this with Honda MTF, AC Delco Syncro oil and Redline MT-90 with 1/2 a litter of Heavy Shock proof???

Is it the syncro, the fork or shift selector????