NISSAN DAYZ HIGHWAY STAR 660cc

Your description is a bit short on particulars, but we’ll give it a shot. First, your gearbox is a manual, right? Just by reading your question, it also seems that it could be a CVT, but let’s assume, for the sake of argument, that it’s a regular manual.

With that said, the most interesting piece of your description is the ending statement that says the “engine does not lock…” If that’s the case, it looks as if you replaced the transmission with a working one, but you didn’t replace the clutch plate or throwout bearing.

Without a working clutch plate, your new gearbox just won’t work because the engine is spinning up to speed and then grabbing at a slipping, sliding clutch plate. Since it isn’t taking up the way it should — it does work in a fashion — your Nissan is performing just the way you would think it would if the clutch plate was shot.

The answer here is replacing the clutch plate so that your engine’s flywheel has something to grab onto when you release the clutch.

It’s a good idea to replace the throwout bearing at this time, too. The reason is simple, it is likely the bearing and its springs have become worn and are partially responsible for creating this problem as a sticking throwout bearing won’t allow complete clutch plate engagement or disengagement. In turn, this causes the clutch plate to wear out.

Be sure that the cables are all set correctly when things before you button up the gearbox so you have eliminated potential problems in the future.