On Jun 9, 7:01 pm, "Christopher Ott" <spamtrap at ottelectronics dot
com> wrote:
> I have a 82' 280ZX (non turbo) which has a bit of noise & vibration
going on
> with the 5 speed transmission. I'm trying to isolate it to the most
likely
> source before I make any decisions on how to proceed. Basically the
problem
> presents itself like this:
>
> I start the engine and put it in neutral, and there is a low whine
coming
> from the front of the transmission which can be felt through the stick.
It's
> not terrible, but absolutely noticeable. If you press the clutch in, the
> noise and vibration disappears. The effect is the same while driving
only
> worse as the whine turns into a slight grinding which also goes away
with
> the clutch disengaged. It does not seem to matter what gear I'm in. Also
the
> clutch seems tight and is not slipping at all...
>
> Everything I've read suggests that it's the front bearing sup****ting the
> input shaft of the transmission. But I've also read that it could be the
> countershaft bearing. I've replaced the clutch on my 79' 280ZX years ago
and
> didn't find it too complex (just alot of labor), but I have no
experience
> working on or diagnosing the transmission itself.
>
> Does anyone with a little more transmission experience have some hints?
>
> Thanks!
>
> Chris
Your anaysis is right on the money. It must be a bearing on the input
shaft or countershaft as they are the two shafts that turn with the
vehicle stopped, engine running and the clutch engaged. They stop
turning with the clutch disengaged. Sometimes a high quality
transmission fluid such as BG Syncro ****ft can prolong the life of an
ailing transmission but if it is already making a grinding noise, it's
probably beyond that. I haven't been in a Nissan transmission so I
can't help on the difficulty of the job. If you have a Factory
Service Manual and can go at it slowly and methodically, you likely
can overhaul it. It might be worth looking into getting a factory
remanufactured transmission, if one can be bought. Sorry I don't have
any practical advice on the repair. Good luck. Al
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