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Re: Nissan 300zx no reverse or 4th gear.
Hi, The first place I would look is the shift linkage for wear and a sloppy connection from wear. adjustments may be made as a possible fix on the linkage rod. Glad to be of assistance - Please rate the response - I can learn from your rating. Thank you
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is there a check engine light on. also if there isn't a scanner can tell you in real time data if a sylinoid is receiving the signal to shift or not if it is recieving the signal but not responding the sylonoid could be bad or the wiring could have been ate up by rats check for any bare or cut and chewed wires,. hope this helps,.
pull the transmission. remove the torque converter (automatics) or clutch and pressure plate (standards), the bolts for the flywheel are under that. make sure you replace the flywheel with the proper one especially if it's a standard.
That means the transmission is going into Limp mode - something's wrong that is making the car believe it can be damaged by the speeds the upper gears will allow you to reach. For starters, check the fluid level (or just change it - it's not a bad idea), and disconnect the battery for an hour or so to put the ECU into relearn mode - this will clear current fault codes and allow you a fresh start to see if the condition reappears, or if it was a fluke failure of some part that caused the car to repeatedly go into limp mode.
I assume this is an automatic transmission. Is it a twin turbo or a non-turbo model? It sounds like you've lost fourth gear and are stuck in 3rd - those RPM would be about right. If you can provide more information, it will probably help in the diagnosis.