Notchy change when grabbing 5th

[PeeBee]

I have noticed that the 5th gear selection is at times notchy and am wondering if the bush in the top of th box is the culprit. Has anyone replaced the two plastic elements, how easy/time involved, tricks to do it would help. This is a TD42 5 speed manual.

[mudski]

You will more than likely find its the age on the gearbox more than anything that is causing your grief. The bushes you mention, may be causing the issue but I doubt it, you would have issues with every gear not just 4th to 5th.

My gearbox was notchy under acceleration from 3rd to 4th, but I had also clocked up 440thou on this gearbox so I put up with it. Then 5th gear went, now I have a box from a 2008 Patrol with low k's on it and its great in every gear.

[PeeBee]

You will more than likely find its the age on the gearbox more than anything that is causing your grief. The bushes you mention, may be causing the issue but I doubt it, you would have issues with every gear not just 4th to 5th.

My gearbox was notchy under acceleration from 3rd to 4th, but I had also clocked up 440thou on this gearbox so I put up with it. Then 5th gear went, now I have a box from a 2008 Patrol with low k's on it and its great in every gear.

OK, good point, all other gears are fine, BD reckons the box only had 40,00 on it when the conversion was done so its now maybe 45,000 old. Or its another BD bullshit story and the box had 8 Million K's on it. Its not doing it all the time, more I thought I was maybe putting a different load on it and the wear was different. Its just a slight crunch or grab, hard to describe. the box runs cool - I had temp gauges on it when i first did the conversion.

[mudski]

OK, good point, all other gears are fine, BD reckons the box only had 40,00 on it when the conversion was done so its now maybe 45,000 old. Or its another BD bullshit story and the box had 8 Million K's on it. Its not doing it all the time, more I thought I was maybe putting a different load on it and the wear was different. Its just a slight crunch or grab, hard to describe. the box runs cool - I had temp gauges on it when i first did the conversion.

Yes that slight crunch or grab as you describe it is pretty much how 3rd to 4th was in mine. It wouldn't always do it, but always did it if i were to be moderate to hard on the loud pedal.

[mudnut]

Are you using GL4, and not GL4+ or GL5? I have found temperature makes a big difference in the way Nissan gearboxes play the game.

[PeeBee]

Are you using GL4, and not GL4+ or GL5? I have found temperature makes a big difference in the way Nissan gearboxes play the game.

No idea Craig. I seem to recall a thinner rather than heavier was the go - background drive into the hubs or something?

[mudnut]

The transfer case in some models were changed from gearbox oil to ATF to reduce the tendency for the front driveshaft turn. But I can tell you from experience, GL4 + and GL5 are too sticky and cause grabbing and wear in the softer synchromesh metals.

The mechanic that fitted the gearbox used GL5. His advice to stop the grabbing, was to drain a half litre from the box and top it off with a bit of ATF.
I couldn't believe what I was hearing !!

I got the right advice, from this forum, to use the correct grade GL4, which I used and the grabbing problem disappeared.

[PeeBee]

The transfer case in some models were changed from gearbox oil to ATF to reduce the tendency for the front driveshaft turn. But I can tell you from experience, GL4 + and GL5 are too sticky and cause grabbing and wear in the softer synchromesh metals.

The mechanic that fitted the gearbox used GL5. His advice to stop the grabbing, was to drain a half litre from the box and top it off with a bit of ATF.
I couldn't believe what I was hearing !!

I got the right advice, from this forum, to use the correct grade GL4, which I used and the grabbing problem disappeared.

Thanks Craig, I will drain and refill as suggested.