Question about 1984 Nissan 300ZX

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My Automatic non-turbo 84 300zx wont work

We put in a new transmission the other day and found out that it only has forward gears, park, and nuetral. when we put it into reverse, it is just a forward gear. what can I do? is it the inhibitor switch or the TCU?

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  • Nissan Master
  • 383 Answers

Pburcham: In studying up on your problem, I could only come up with a few possibilities from your description.
1. Linkage adjustment
2. A problem with the "Low and reverse Brake band"
however, this usually has a symptom of poor acceleration
due to the transmission slipping. That band has to grab the drum to hold for low gear.
3. Problem with the manual valve in the valve body.
4. Damaged seals causing pressure leakage which will keep the clutches from locking up.
5.Defective "High Reverse clutch" (front) check ball
Possibly a few other things, but everything (unfortunately) is still internal. The inhibitor switch is for the starting circuit and just keeps you from starting the car in anything but park and neutral.
Transmission control unit will not have this harsh an effect. It should operate without the TCU. You should be able to do a manuel shift with the transmission.
Sorry I couldn't be of more help.
I can say one thing, these transmissions were not known for failures, consequently should be a dime a dozen in salvage yards.
Why or how you got a bad one?????? Don't know?
If I can help, let me know........

Posted on Apr 23, 2009

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