I've got a SR20 gearbox for sale, it was removed from my S14, it pops out of 4th at very low revs (1500-2000RPM) if your driving and its under load it will stay in gear no problem so it doesn't affect cruising in 4th if you daily your car, was told it the plastic cup on the bottom of the shifter but I don't have another to try, so I don't know, Also the the release bearing tube is broken off but I can get that welded back on for £15 or you can just replace it as its a one pice with the front plate that bolts on and off Gearbox as it stands £80 Gearbox with tubed welded back on to the plate £95 PM if your interested Or text / call me on 07784714916 Thanks