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Old 20-03-2018, 09:43 AM
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Old.Tony Old.Tony is offline
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The auto transmission has a pump inside that delivers oil through to all of the innards. No pump = no delivery but if the output shaft of the gearbox is turning, then some few innards are also turning but without oil being delivered. At 120km/h they'll be turning quite quickly, too, hopefully just 20 seconds didn't cause it any drama.

That's the reason why you can't tow an auto for extended periods, because even in neutral, some of the gearbox innards are moving but the oil pump isn't. Manual doesn't have that issue because by turning, the gears pick up the oil and throw it around.

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Old 27-03-2018, 11:03 AM
L3T5G04x4 L3T5G04x4 is offline
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Thanks Old.Tony. I did a bit of youtube research on Torque Converters and auto box planetary gear systems, its quite fascinating how it all works. TC is Basically a turbine liquid coupling. My Ute is still at service centre, Nissan approved the replacement of the diff, they are still waiting for a part before it all goes in, so much mystery......what is this mysterious part, hopefully its a prop shaft that is balanced and perfectly in round! I can only assume they removed front drive shaft and did test drive with no improvement, detail is not very forthcoming :-( so I guess they are back at the diff being the problem a month later.
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Old 16-04-2018, 04:48 AM
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the_bluester the_bluester is offline
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Been a while since I have posted on here. I had a trawl through this thread and reckon people are talking about the same issue I have with my D23.

Around the 100/110KMH mark mine intermittently develops a shake, I would not call it a vibration as I think that tends to confuse the issue with the likes of a tailshaft vibration that makes the car buzz. In my case at least it is like an poorly balanced wheel, had it balanced a couple of times with more or less no change to the car. When it gets going the tub gets a fair shake on, you can see it as mine has a canopy fitted and you can see the canopy shaking in the mirror.

I reckon it is suspension related, mainly a poor match with the 18" wheel and tyre package. When I test drove an ST I thought it was a nicer package on the road than the silly bloody 18" things on the ST-X, they just add cost, harshness and noise in the name of cosmetics. What I have found is that when mine is somewhat loaded the issue goes away. We had a week away on the school holidays and when we had the gear in the back (Couple of hundred kilos) it was as smooth as you could ask for, I drove it for hours at a time without an issue. Likewise when I tow my track car, not so much as a quiver.

I have played with tyre pressure quite a bit and it improves it a touch but to make it much better you have to lower them further than I like to go. I suspect better dampers would probably rein it in, I might have to see if I can extract some money from my lease fund (It has a silly positive balance from my last car) and throw a set of Bilsteins at it. The body control over long undulations I would put down as marginal at best anyway so a change would probably improve the car. Mine is a series 2 with apparently much better body control, I hate to think what the NP300 badged cars must have been like.
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Old 16-04-2018, 08:16 PM
LJG LJG is offline
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I did not have the issue with my series 2, till I changed recently to 285/60/18 all terrains. Then it started, which didn't really surprise me given the extra weight of the bigger all terrain tyre. Balancing did not fix it so I tried some SupaMax glass tyre balance beads. I put 6oz (half a bag) in each rear tyre. Problem solved. At $5 for the bag it was a cheap fix.
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Old 23-08-2019, 10:23 AM
2017 2017 is offline
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Originally Posted by D23 View Post
G'day everyone.
I'm new to the forum and hope that somebody can help me out.
I bought my new NP300 STX in January this year. It has had a vibration problem from new. The dealer originally acknowledged this. They have swapped wheels and tail shaft. I've lost count how many wheel balances it's had. I traded a D40 V6 4lt petrol in on the NP300. That was my first mistake, the D40 rode much better on sealed roads.
Now that I'm no longer being helped by Nissan, I took the car to another tyre specialist who said that there is noting wrong with wheels and tyres and as far as he's concerned its a vehicle problem, take it up with Nissan. But Nissan say the vibration is within their parameters. It's horrible to drive on the highway.
Any clues?
Hi D23, is your problem with the Vibration sorted
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Old 04-02-2020, 12:41 PM
Hereward 2013SpanishD40 Hereward 2013SpanishD40 is offline
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Originally Posted by happy john View Post
Could be a multitude of problems, have they removed the front driveshaft and tested it on road with it removed?.
Very unlikely to be the drive shaft unless it's been removed and installed upside down. Don't laugh, had this happen in my classic 2000 Datsun Roadster back in the 90's. Took me 2 months to work out the problem darn it.
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