2 things; If you jack up one front wheel, stick it in gear, does it try and turn the engine? If it does then the trans is turning. Did you check the trans operated in all gears before you fitted it?
Next, is it possible the clutch friction plate is in backwards. If so then the raised side that holds the damper springs is hard up against the fly wheel and causing the drag that prevents the clutch from releasing.
I cant help with info as to whether the trans is a fit but while you are underneath the hood, look and see if the clutch arm appears to move the right amount when the pedal is pressed. The only other thing I can think of is that the trans is seized somehow. You can test this while its jacked up by starting up on idle with it in gear, the raised wheel will turn.. Try this in all gears but BE CAREFUL with it on jacks, better to have jackstands under both sides.
You might have to shift the transmission by hand when you jack it up... Your shift cable may be broken. If you purchased a Transmission from a spyder then you should be good no matter the year. Like the last answer said jack the entire front of the car up and put it in gear start the car have a friend stand and watch the tires to see if they move. Then you from inside press the clutch the tires should slow down to stop if so the clutch is good and your shift cables are shot. Not enough info sweetie why did the transmission go bad in the first place and did you put a new clutch in the car with the used trans?
In order to shift it manually you have to shift the levers one the transmission itself to see if your shift cable is bad. Normally a bad cable is torn or limp when you grab it at the transmission. You still have not given enough information on why the old one was removed. Was the old one shifting properly?
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SOURCE: Removal of slave clutch master cylinder
The hydraulic cylinder is in the bell housing. When you separate the motor and tranny, you will see it as a unit with the throw-out bearing. Take the hydraulic line off before you start. You will have to bleed it when you are done.
SOURCE: 1988 Porsche 944S Gear wont shift when engine is running.
replace the clutch ,its easy on this model last one i done took all of 20 mins to dismantle ,an hour and a half to go and get clutch including stop for coffee and 30 mins to re -assemble and dont forget to use copper ease grease on the spigot shaft
SOURCE: HI, I RECENTLY BOUGHT A 1990 NISSAN 300ZX NON
being 1991, and a sport car, good idea to go ahead and replace slave cylinder since you have them and very easy to replace. If you able to push your car while is in any gear more likely the clutch pad pressure plate are worned and slipping. If you can push the car while is in gear even the engine is not running than it will be your clutch pad and your presure plate is shot that would mean you tranny has to come out. once you in the tranny you might as well replace with new clucth pad, pressure plate and throw out bearing. Also check your fly wheel make sure is not ate up. if it is then you will have to have the flyweel resurface by a machine shop. using the lift is the best way to work on the Z. most garage will charge 400-500 to do the work.
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SOURCE: What would prevent the clutch
Have you considered the syncronizers? if they are the problem though you will need a mechanic to repair it as they are not DIY unless you have a lot of experience
Check the slave cylinder is coming out when you push the clutch down ,without my head under the bonnet its difficult to say but either you have lost the fluid or the thrust bearing has now pushed through the pressure plate with the correct pressure .
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