Nissan S15 Silvia original 6-speed gearbox can be said to be the biggest weakness of this last generation Slivia. (Gearbox design problem)
The Japanese tuner HPI also launched an enhanced gearbox for this reason!!
IN STOCK!!
https://www.iautoracing.com/products/hpi-6-speed-cross-tranamisson-gearbox-nissan-s13-s14-s15-silvia-180sx-200sx?_pos=1&_sid=f49bfab6a&_ss=r