5th gear went Pop

[dom14]

In 2016, I blew mine driving along the freeway home, 110kph, no towing and minimal on-board load. Zero warning, just went bang.
.

Yep, and that concerns me a fair bit, 'cos if it happens in the middle of an off road track when going on solo, it can end up bad.
Of course, going solo off road too far is a no no, but there are nuts who does that occasionally, like myself.

There are some synthetic additives out there to add to gear oil to make things run smoother and get more k's out of a box.
Dunno how good they are though.

[Avo]

Yep, and that concerns me a fair bit, 'cos if it happens in the middle of an off road track when going on solo, it can end up bad.
Of course, going solo off road too far is a no no, but there are nuts who does that occasionally, like myself.

There are some synthetic additives out there to add to gear oil to make things run smoother and get more k's out of a box.
Dunno how good they are though.

going solo off road by oneself is not a no no...you just have to be prepared,,,enough food n water,stay by your car if something goes pair shaped,,they always find the vehicle first...

[dom14]

going solo off road by oneself is not a no no...you just have to be prepared,,,enough food n water,stay by your car if something goes pair shaped,,they always find the vehicle first...

Yeah, I've done with a sat phone in the past. I meant the recovery of the vehicle can end up as dangerously expensive unless there are mates not too far who can help with dragging the vehicle to a main road.

My anxiety actually isn't about dying(I hope) 'cos I do carry lot of dry food & water. It is about having to let go the vehicle.
You get attached to the troll after few years, or at least I do.

[Avo]

Yeah, I've done with a sat phone in the past. I meant the recovery of the vehicle can end up as dangerously expensive unless there are mates not too far who can help with dragging the vehicle to a main road.

My anxiety actually isn't about dying(I hope) 'cos I do carry lot of dry food & water. It is about having to let go the vehicle.
You get attached to the troll after few years, or at least I do.

meh i bought it for the wife..easy come easy go......

[themage21]

Yep, and that concerns me a fair bit, 'cos if it happens in the middle of an off road track when going on solo, it can end up bad.
Of course, going solo off road too far is a no no, but there are nuts who does that occasionally, like myself.

There are some synthetic additives out there to add to gear oil to make things run smoother and get more k's out of a box.
Dunno how good they are though.

Mine is a '00 GU - part of the bunch that had the crappy 5th gear from factory. It had towed camper trailers in the previous owners usage, not sure what it did in owners before then. It lasted 260k - not bad for a second rate part. But if you have to take out the gbox one way or another, I'd always vote reco, unless you know that the replacement box is from outside of the affected year range.

Additives aren't going to help, because it's not a heat/wear thing, the splines actually tear and round over from mechanical overload/fatigue. I've got my old layshaft and gear and you can see where the shoddy gear never engaged with the end of the spline. Outside of that, the shaft and gears all look like they're brand new, because of regular oil changes.

[dom14]

Mine is a '00 GU - part of the bunch that had the crappy 5th gear from factory. It had towed camper trailers in the previous owners usage, not sure what it did in owners before then. It lasted 260k - not bad for a second rate part. But if you have to take out the gbox one way or another, I'd always vote reco, unless you know that the replacement box is from outside of the affected year range.

Additives aren't going to help, because it's not a heat/wear thing, the splines actually tear and round over from mechanical overload/fatigue. I've got my old layshaft and gear and you can see where the shoddy gear never engaged with the end of the spline. Outside of that, the shaft and gears all look like they're brand new, because of regular oil changes.

It would be great if you can post a picture of that here.

What is time period the bad 5th gear was installed into the GU gearbox?

[sooty_10]

It would be great if you can post a picture of that here.

What is time period the bad 5th gear was installed into the GU gearbox?

There is good pics floating around showing the changes. Potentially on the other patrol site. I will endeavour to get some pics if I get my old gearbox back from the mechanic.

The problem boxes I believe were early TD42t/ZD30 GU's up till some stage in '02.

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[Cuppa]

What year was the gearbox issue fixed by Nissan - & what was the fix? A beefed up 5th gear pinion?

[sooty_10]

What year was the gearbox issue fixed by Nissan - & what was the fix? A beefed up 5th gear pinion?

I believe it was a problem up till some stage on '02. From all my reading you are safe of the box is from an '03 or up. Mine was an '01.

Yep the solution is longer splines of the main shaft for 5th gear to engage on, and I believe a slightly wider 5th gear.

Further more my research has shown that the CRD has lower gear ratios for the first 3 and a taller 5th. I'm going brand new box so should all be sweet and I am getting the CRD box for a lower first gear.

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[dom14]

I believe it was a problem up till some stage on '02. From all my reading you are safe of the box is from an '03 or up. Mine was an '01.

Does that include the GQs RB30 & TB42 boxes as well?!!