S14 trans stuck in 5th gear - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

2laneblacktop · 04-12-2020, 05:04 AM

Hi all, hope everyone is staying safe and healthy during this pandemic.

Tonight I took my mostly stock Zenki S14 out on the highway for an Italian tune-up - I drove it hard in 2nd, 3rd, and 4th, backing off as I upshifted to 5th and decelerated. No shifts were missed, and no grinds.

At my turnaround exit, the trans would not shift out of 5th. I stopped, turned off the engine, and still the trans was stuck - I applied force but backed off not wanting to break something. Clutch operation was normal, fully disengaging the engine from the trans when pressed.

I was in a high-crime neighborhood, so I started the car and managed to limp it home in 5th gear all the way, and only had to run 3 red lights (thankfully it was 1 AM and no traffic). I tried several times to downshift on the way, to no avail. It only let go of 5th gear when I hit a hard bump in the road, jarring the whole car and stalling the engine. After that I started the car, it shifted into first normally and I got home.

Any ideas for this? I'm running Redline Lightweight Shockproof Gear Oil, which does a great job eliminating the grinds I used to have. The slave cylinder is fresh as is the clutch fluid, and yes I bled the system. The clutch did not seem to be the issue, the shifter or gearbox did not want to let go of 5th. Thanks...

04-12-2020, 05:04 AM	#1
2laneblacktop Join Date: Dec 2009 Location: Seattle, WA Age: 53 Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	S14 trans stuck in 5th gear Hi all, hope everyone is staying safe and healthy during this pandemic. Tonight I took my mostly stock Zenki S14 out on the highway for an Italian tune-up - I drove it hard in 2nd, 3rd, and 4th, backing off as I upshifted to 5th and decelerated. No shifts were missed, and no grinds. At my turnaround exit, the trans would not shift out of 5th. I stopped, turned off the engine, and still the trans was stuck - I applied force but backed off not wanting to break something. Clutch operation was normal, fully disengaging the engine from the trans when pressed. I was in a high-crime neighborhood, so I started the car and managed to limp it home in 5th gear all the way, and only had to run 3 red lights (thankfully it was 1 AM and no traffic). I tried several times to downshift on the way, to no avail. It only let go of 5th gear when I hit a hard bump in the road, jarring the whole car and stalling the engine. After that I started the car, it shifted into first normally and I got home. Any ideas for this? I'm running Redline Lightweight Shockproof Gear Oil, which does a great job eliminating the grinds I used to have. The slave cylinder is fresh as is the clutch fluid, and yes I bled the system. The clutch did not seem to be the issue, the shifter or gearbox did not want to let go of 5th. Thanks...