92 cruiser worn synchros

Submitted: Friday, Jan 06, 2012 at 08:01
ThreadID: 91042 Views:2374 Replies:6 FollowUps:7
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Morning all, wish you all a good new year.
I have a 92 landcruiser manual box and the 2nd and 3rd gear are starting to crunch into gear occassionly. On another forum i was told changing the oil to either MT-90 or lightweight shockproof redline oil will do wonders. Has anyone had any experience with this and if so which oil would suit best . would appreciate any help. cheers Barry
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Reply By: Hairs & Fysh - Friday, Jan 06, 2012 at 08:29

Friday, Jan 06, 2012 at 08:29
Hi Barry,
About four years ago my old girl was doing the same, had no idea how old the oil was so I changed it. The only thing not to be recorded in the log books that came with her when I purchased her in August 05.
I used Nulon 75W-90 semi Synthetic in both the gear box as well as the tranfer case, it made a big difference.
I'd try changing the oil first, if the problem persists you'll have to look deeper.



AnswerID: 474188

Follow Up By: Member - BarryL2 - Friday, Jan 06, 2012 at 08:41

Friday, Jan 06, 2012 at 08:41
Thanks for the info,
75W-90 is the oil i`m running at the moment, was changed only 3000km ago with a new clutch, this crunching has started since and i have no idea what oil was in before so i guess i will keep looking. cheers
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Follow Up By: Hairs & Fysh - Friday, Jan 06, 2012 at 09:04

Friday, Jan 06, 2012 at 09:04
Yeah, 3000k's isn't many.
Maybe the master cylinder or slave is allowing some fluid past a worn seal.
Some times grit in the system will score the bores if the plungers are pushed to the stops, Does the peddle still feel right? You mentioned it happens in 2nd & 3rd, so it might not be this.
I just recently changed both mine because the pedal wouldn't return properly after a fluid change in preparation for a month on the road.
Hope you find the reason for it.



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Follow Up By: Ray - Friday, Jan 06, 2012 at 09:25

Friday, Jan 06, 2012 at 09:25
Syncros were a luxury when I learnt to drive and we had to " double de clutch" when changing gears. Engine speed and road speed was very important or you would get an awful crunch. In some instances you had to "rub" the gears together so that they would slip in smoothly. The very clever drivers could drive a vehicle and only use the clutch to "take off"
But none of this information can help you in your circumstance.
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Follow Up By: Ray - Friday, Jan 06, 2012 at 09:27

Friday, Jan 06, 2012 at 09:27
I must add that they were called crash gearboxes.
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Reply By: Member - Rob S (NSW) - Friday, Jan 06, 2012 at 09:42

Friday, Jan 06, 2012 at 09:42
Hi Barry

I have the same problem with the synchros,as probably 90% of all other old crusiers have LOL.
And cold shift problems.

I changed the gear box oil about 8 weeks ago to redline mt90.
And there was a noticeable improvement in cold shift ,and improvement on the gear change between gears 3rd and 4th.
This can also be improved buy how you shift gear.
I find buy pausing briefly between gears and release the weight of the gear stick momentarily improves shifting no crunching at all.
Or the old double shuffle works well too.

I think redline is well worth a try, until you decide to drop the gearbox out, wait till you need to do the clutch.
As the gear box should battle on like that for a long time.

The best place to get redline is this guy on ebay

Site Link

Rob









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and that's when I thought I was wrong!

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AnswerID: 474196

Follow Up By: Member - BarryL2 - Friday, Jan 06, 2012 at 10:15

Friday, Jan 06, 2012 at 10:15
Thanks for that Rob,
I have done a fair bit of research and red line seems to be the way to go, just wasn`t sure which one so i will give mt-90 a go
cheers, Barry
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Reply By: ross - Friday, Jan 06, 2012 at 11:53

Friday, Jan 06, 2012 at 11:53
What model is it? If its an 80 series with 300000klm+ it probably needs new synchroes.
If its a 75 series ,you might be lucky with an oil change.
AnswerID: 474204

Reply By: lostinwauchope - Friday, Jan 06, 2012 at 15:45

Friday, Jan 06, 2012 at 15:45
Hi Barry,
I had a 91 80 series with the same problem 400,000 ks changed to castrol vmx the crunching slowly stopped after about 500 or so ks 455,000 now still smooth cheers Ron
AnswerID: 474221

Follow Up By: 93 Navara - Saturday, Jan 07, 2012 at 14:01

Saturday, Jan 07, 2012 at 14:01
Second the castrol vmx-v. Still noticeable but markedly better.
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Follow Up By: get outmore - Saturday, Jan 07, 2012 at 19:41

Saturday, Jan 07, 2012 at 19:41
been using VXM-M for over 3 years and it might have helped a bit but pretty much i double clutch on the down shift been like it for 6 years so im not holding my breath for it to go bang
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Reply By: howesy - Saturday, Jan 07, 2012 at 23:00

Saturday, Jan 07, 2012 at 23:00
The only oils to use are a straight 75W oil or Transmax Z (synthetic auto fluid) or the one I like the most Is Mobil agri fluid 424 designed specifically for 4WD and wet clutch environments (friction addatives included)
I can change down to 2nd at 40km/h with slight rev no worries in a 75 series with 445K up on it
AnswerID: 474336

Reply By: Bernie C - Monday, Jan 09, 2012 at 11:32

Monday, Jan 09, 2012 at 11:32
I notice a big difference using Redline MT90 and gear changing and it reduced noise from the box as well. Not cheap though
AnswerID: 474457

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