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Discussion Starter #1
G'day,

Am having an issue with my gearbox and have tried a few searches and a few simple things but nothing has worked so far. Basically, when I'm trying to get into gear it feels like a crash box. Very hard, can feel it clunk, very stiff, makes my gear changes very long. There's no actual grinding noise, it does it when freezing cold or even when warmed up. However it doesn't do it all the time, it can be perfect one day. Clunking around the next.

Things I've done;
New clutch was installed and fly wheel machined
I tried nulon additive (2 bottles, no luck)
Transmission oil is looking full and good (roughly 30k KMs old)
I checked transmission brackets and bolts, all tight.
I've tried pushing down more on the gear stick when changing gears, has no affect really

In thinking of swapping out transmission oil maybe it's too thin? It seems right. Have had the car a year, hasn't always been like this. Has gotten worse the past month or so

Cheers
 

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GQ Dual Cab. TD42Ti with fruit.
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I would try a full synthetic oil. That is what I did when my box started to get clunky. It made a big difference. I used Penrite Pro Gear. Not cheap, but sorted out the box.
 

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GUII ZD30DI Wgn
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46,307 Posts
In my GUII I use Manual VMX-M 75W-85. I had issues a few years ago with synchro etc and went to this which did make changes smoother, later 5th gear dropped it's bundle becuase of a known fault with early box's, so it was rebuilt but I stayed with the oil because it had been so kind to me earlier, still using it.
Just another option.

Secondly, another trick to try which was told to me by a Nissan Mechanic, with engine running, foot off clutch and on brake, put pressure on gearstick into each gear that is giving an issue, not enough pressure to actually go in but enough to semi engage synchro, worth a try.
 

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1989 GQ TD42 wagon
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2,232 Posts
Have you checked the clutch system is working correctly? I'm wondering whether the slave/master cylinder have an intermittent issue; bulging soft line; etc.
 

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Discussion Starter #5
In my GUII I use Manual VMX-M 75W-85. I had issues a few years ago with synchro etc and went to this which did make changes smoother, later 5th gear dropped it's bundle becuase of a known fault with early box's, so it was rebuilt but I stayed with the oil because it had been so kind to me earlier, still using it.
Just another option.

Secondly, another trick to try which was told to me by a Nissan Mechanic, with engine running, foot off clutch and on brake, put pressure on gearstick into each gear that is giving an issue, not enough pressure to actually go in but enough to semi engage synchro, worth a try.
I might try the Penrite Pro Gear oil mentioned first, but I'll try the brake pedal trick! Should I do it everyday before driving ?
Have you checked the clutch system is working correctly? I'm wondering whether the slave/master cylinder have an intermittent issue; bulging soft line; etc.
I haven't no, what are some tests I can do to see if it's working correctly ?
 

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GUII ZD30DI Wgn
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I might try the Penrite Pro Gear oil mentioned first, but I'll try the brake pedal trick! Should I do it everyday before driving ?
No just try it several times in quick succession, if it works fine, if it doesn't nothing lost.
 

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nissan patrol y61 td4.2tdi
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Hi Team,
had same issues as you, resolved by using Castrol VMX80 Manual Transmission Fluid, as was recommended by others on here some time in the past.
If I have an issue now it has always been the floor mat has worked its way forward and restricts the clutch pedal travel--clutch not fully disengaged.
Your experience may vary.
Cheers,
Eddie B.
 

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Discussion Starter #8
No just try it several times in quick succession, if it works fine, if it doesn't nothing lost.
Gave it a go, worked first thing this morning but after nah.

Went to do my oil, however the filler plug was that tight I've rounded it out and am trying to chase up a plug for it. Bugger
 

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GQ Dual Cab. TD42Ti with fruit.
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The Castrol VMX was what I used before going to synthetic. It worked well before the box started getting tired.
 

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nissan
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Sounds like a clutch hydraulics issue to me, or possibly pressure plate. Did you replace that as part of the clutch replacement?
 

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Discussion Starter #11
Sounds like a clutch hydraulics issue to me, or possibly pressure plate. Did you replace that as part of the clutch replacement?
Yeah the pressure plate was changed out as it came in the pack, what do you think could be the go with the hydraulics ?

It's got plenty of fluid, maybe needs replacing ?
 
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