300Zx will not shift out of 5th gear

Probably issues with Shift Solenoids. You need a transmission specialist or an auto electrician with a pro grade bi-directional scan tool computer that can tell the solenoids to operate and confirm that they did. Or it is the powertrain module that is at fault.

Hello. It seems the 'shift fork' is either 'misaligned' and/or 'bent' in 3rd, 4th, 5th and REVERSE. It's, also, possible those gears are 'stripped' on their shaft(s); making driving that truck, in those gears, impossible. Good luck and keep me informed; if you want to.

if cables are used to change gear to the gear box check those

shift stick bush worn ..remove center console

internal gearbox shift rods syncro / scroll pin broken

clutch system master or slave or pressure plate issue

any noise from gearbox when you engaging clutch when engine is running? Check for oil as well. Firstly I suggest to drain oil out and check for particles in the oil, synchros could be damaged

Yes you have to least have new gear synchronizers installed

HI there unfortunately that is the correct solution
the reverser gear fork or reve gear syncros
are both inside trans housing
You should sand trans out and all the gear checked
and replaced not just reverse gear ok


good lock

DEXRON II

Dear javatrader: There are very few solutions to this problem. The fact that you had mentioned 5th & Reverse, tells me that you problem is has two possibilities. Both relate to the same component.
The shift fork for Fifth gear and reverse are the same as well as the hub which the fork fits over.
When you Move the stick shift, it moves one of 3 rails in the transmission of which one is 5th and reverse. The hub is what locks the transmission in gear. The gears are what are referred to as synchromesh. This means that when you shift from gear to gear, it makes it possible to easily make the transition without the gears grinding while the car is in motion. The synchros are in fact, kind of a "BRAKE" for the gears so that when you go to shift into that gear, the synchronizing ring, slows the gear down enough to match the speed of the counter gear allowing it to engage with it, without grinding. As the hub slides into gear, there are spring loaded "KEYS" which are small pieces of steel about 1/2 inch long, 1/4 inch thick and 1/4 inch wide with a little hump in them to push up into a small cavity machined into the hub when it slides over it, thus locking the gear into place until you pull the stick to move it out of place. If a key pops out, it could cause the gear to stick, not allowing you to pull the hub back because the key has popped out at an angle which prohibits the hub from sliding over it.
Another possible senario: The fork is secured to the shift rail with a part called a "Roll pin". If this part shears, the car will be stick in what ever gear it was in at the time the pin sheared. If the pin shears, the stick will still move out of 5th gear position but the transmission won't.
This problem, unfortunately is not one a layman can fix. This is best left to a professional.
Good luck......If you are pleased with my answer, please write in, that you are satisfied with my answer. I am new in this "FIXYA" group and need more people responding to work my way up the ranks.

motor monts

Sounds like you may have bent a shift fork or your cluster gear has some missing teeth on it now. I would venture to say that is it a bent shift fork. This will require the transmission be removed to gain access to inspect and repair.