g.q patrol gear box

Submitted: Tuesday, Nov 26, 2002 at 01:00
ThreadID: 2470 Views:8084 Replies:7 FollowUps:3
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i am having trouble with gear changes when cold. hard to change from first to second. sometimes hard to select first and reverse when still.
prety good when fully warmed up. also vibrations from idle to 1200 rpm in any gear. better tell you about the patrol.
its a 1989 4.2 diesel with 190000 km , snorkel , 3" exaust
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Reply By: Tuco69 - Tuesday, Nov 26, 2002 at 01:00

Tuesday, Nov 26, 2002 at 01:00
Change the g/box and t/case oil to synthetic. The cold hard shifting symptoms will be cured.
AnswerID: 9026

Reply By: kezza - Tuesday, Nov 26, 2002 at 01:00

Tuesday, Nov 26, 2002 at 01:00
Penrites Manual Gear Oil Light will fix your gearbox and speed up all your shifts. (It is a heavy duty gearbox oil reccomended for the patrol but a 'Light' version to keep the stickiness at bay). If selectors/syncro worn too much you may have to double clutch 1st to second in really cold weather to prevent further wear in any case.)
While your at it do your rear diff a favour and change the oil to penrites Limslip 140 (NOT 140/85) The patrols LSD the only one this heavier oil suited to (use the lighter oils for toyotas and Pajeros) Your LSD will operate much better and smoother too. Checkout penrites tech support if any queries or their website.
kezza
AnswerID: 9028

Follow Up By: Bb - Wednesday, Nov 27, 2002 at 01:00

Wednesday, Nov 27, 2002 at 01:00
Thanks for the info . I have thought about using a thinner oil but needed to hear from other patrol owners .Will give it a go.
The rear diff is a factory locker not l.s.d. so that is not a problem.
Have not had to double clutch into 2nd ,just have to take it easy and let it go in when ready.
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FollowupID: 4530

Reply By: IAMGQ - Wednesday, Nov 27, 2002 at 01:00

Wednesday, Nov 27, 2002 at 01:00
I have similar symptom on my GQ 93 diesel (350000k). Even I have changed to Penrite Man Light (80w/85), the shift from 1st to 2nd or vice versa is still difficult in morning (ambient temp ~17 to 22oC).
It is better for 1st to 2nd after 15mins drive. But from 2nd to 1st need the car almost in walking pace or slower than that.
Would it be normal to allow shifting to 1st at such low low speed?
Anyone can help ?
AnswerID: 9036

Reply By: Truckster - Wednesday, Nov 27, 2002 at 01:00

Wednesday, Nov 27, 2002 at 01:00
Has it just started??? or gradually got worse?
Have you changed oil recently?

Does double clutching do anything different?? Try and see!

So when the oil gets hot and thins out its better, so changin oil for thicker oil probably wont do much? 190k klms isnt much really, I know of a few at 500k klms still going, btu depeds on history of the car dont it!

Take it in for a G'box service, they will tell you whats up..
AnswerID: 9037

Follow Up By: Bb - Wednesday, Nov 27, 2002 at 01:00

Wednesday, Nov 27, 2002 at 01:00
Always been the same for 20000km. That i have owned it. Prety shore it has not been floged. All oils in gearbox,transfer,front and rear diff were changed as soon as i got it home.
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FollowupID: 4533

Reply By: Stevo - Wednesday, Nov 27, 2002 at 01:00

Wednesday, Nov 27, 2002 at 01:00
bb the problem is known as "cold gear baulking".
Nissans are well known for it and I have experienced it
in both the GQ and GU.
To remedy the problem use an oil with a viscousity index of 5 less than the manufacturers recommendation.
Valvoline produce a product called Duragear (75/85) which is synthetically fortified. Not cheap but the difference is absolutely amazing!!
Interesting comment on the vibration. My GQ developed the same but I sold it without ever determining what it was.
AnswerID: 9044

Reply By: chrisfrd - Wednesday, Nov 27, 2002 at 01:00

Wednesday, Nov 27, 2002 at 01:00
I've read that the vibration that comes from a slow-idle or taking off can be from the clutch.

The fly-wheel on the GQ's have a tendancy to go out of whack a little causing the vibration that you feel.

My mate's GQ 2.8 suffers from it and in a few years, so will by GU 3.0.

That's if it gets that old, the way the Turbo is going I'm suprised I haven't burnt the ***ker to the ground yet!
AnswerID: 9048

Follow Up By: Bb - Wednesday, Nov 27, 2002 at 01:00

Wednesday, Nov 27, 2002 at 01:00
Thanks for that but don"t think it is from the flywheel. If it was it would do it in neutral as well. when reversing out of my driveway it will viberate under 1200rpm untill I slip the clutch a bit,then it stops.
Come to a intersection or rounderbout and let the revs drop below 1200 rpm with the clutch out it will viberate.
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FollowupID: 4534

Reply By: Jozef - Saturday, Dec 07, 2002 at 01:00

Saturday, Dec 07, 2002 at 01:00
bb,
I had similar problems. It ended up being a dry mainshaft spline, where it goes through the clutch driven plate. It is a cheap fix, once you pull the gearbox out! A bit of grease on the spline, and no more problems.
We only fluked the remedy, as we had pulled the gearbox out ready to check/replace all sort of bits and pieces. Haven't had that problem now for about 5 years, and 80000kms.
Hope this is some help to you
Joe
AnswerID: 9393

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