80 Series Landcruiser Vibration Problem.
Submitted: Friday, Dec 11, 2009 at 12:11
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6
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Bugs
Hi to everyone at ExploreOz.
I have an 80 series Turbo Diesel GXL 1991 model and when doing speeds of 100km/h or faster I experience a vibration which seems to be coming from the rear. The vibration only happens when coasting and it is not present while accelerating or when I back the acceleration off altogether.
I suspect the rear drive shaft but while mounted in the truck it seems to be ok.
A suggestion was made to me to remove the rear drive shaft and to lock the centre diff and take it for a
test drive to see if the vibration is no longer present with the rear shaft removed.
Is it advisable to
test the vehicle as suggested above ? I am a little concerned about doing over 100km/h with the centre diff locked, but I also assume seeing the rear drive shaft is removed this should not cause a problem. Or if anyone has any other suggestions or advice would be appreciated.
Thanks in advance.
Joe.
Reply By: Wayne (NSW) - Friday, Dec 11, 2009 at 12:22
Friday, Dec 11, 2009 at 12:22
Joe,
It does sound like a drive shaft problem. A worn uni joint can be hard to pick up while it is still on the vehicle.
Removing the rear tail shaft and locking the centre diff will not be a problem. I have had to do the same when I had a rear diff problem. The vehicle will feel a bit different to drive at first because it will be a front wheel drive.
This should narrow the search down.
Wayne
AnswerID:
394604
Follow Up By: Bugs - Friday, Dec 11, 2009 at 12:29
Friday, Dec 11, 2009 at 12:29
Hi Wayne.
Thanks for your advice.
I now feel more confident to try the procedure.
Once I have tried it will post back the results.
Thanks.
Joe.
FollowupID:
662944
Follow Up By: Member - ross m (WA) - Friday, Dec 11, 2009 at 21:11
Friday, Dec 11, 2009 at 21:11
You could also take the shaft to a
shop that specialises in drive shafts. They can also
check the uni joins as
well
Its cheap,even if it needs balancing
FollowupID:
663029
Reply By: Hairs & Fysh (NSW) - Friday, Dec 11, 2009 at 14:02
Friday, Dec 11, 2009 at 14:02
Hi Joe,
Just went though the same drama with my 80, It was the front uni of the front shaft that was stuffed. It felt like it was in the rear. I replace all four uni's, about 140 bucks and an hour & 1/2 of my time. all is good now.
AnswerID:
394621
Follow Up By: Bugs - Friday, Dec 11, 2009 at 14:50
Friday, Dec 11, 2009 at 14:50
Hi Jon and thanks for your response.
I just returned from testing with the rear shaft off and the vibration is still there. So it seems I may share the same problem as you had.
One of the unis in the rear shaft feels a bit jerky and not smooth so I tought it was the culprit. But no luck there. I will wait until Monday and just replace both unis on the rear shaft before putting it back on, then will remove the front shaft and
check it out and likely replace both there too.
Will keep you all posted.
Cheers.
Joe.
FollowupID:
662964
Follow Up By: disco driver - Friday, Dec 11, 2009 at 15:52
Friday, Dec 11, 2009 at 15:52
Bugs,
While you have the rear shaft off
check the wear in the sliding spline and make sure it slides freely. Do the same thing with the front one when you get to it.
Worn splines on the driveshafts can cause a serious vibration too.
Disco.
FollowupID:
662973
Follow Up By: Bugs - Friday, Dec 11, 2009 at 18:42
Friday, Dec 11, 2009 at 18:42
Hi Disco.
Thanks for the tip, shall
check it out also.
Cheers.
Joe.
FollowupID:
662998
Reply By: Member - Lotzi (QLD) - Friday, Dec 11, 2009 at 20:29
Friday, Dec 11, 2009 at 20:29
Sounds like uni joints, but I would also pump some grease into the splines and uni joints to see if the vibration lessons, then go for a road
test, get underneath the veh and give everything a good wiggle. With constant 4wd, you will find that you get greater spline wear.
Cheers
AnswerID:
394668
Reply By: Member - Phil G (SA) - Friday, Dec 11, 2009 at 23:03
Reply By: Member - bungarra (WA) - Saturday, Dec 12, 2009 at 10:32
Saturday, Dec 12, 2009 at 10:32
excuse my ignorance ......but when removing the drive shaft..what is meant by locking the center diff?
"A suggestion was made to me to remove the rear drive shaft and to lock the centre diff"
I just assumed that you would remove the drive shaft and the yokes each end would simply spin?
AnswerID:
394740
Follow Up By: Wayne (NSW) - Saturday, Dec 12, 2009 at 11:01
Saturday, Dec 12, 2009 at 11:01
bungarra,
The vehicle in question is an 80 Series and is a constant 4WD.
It has a 3rd diff in the transfer box known as the centre diff which has to be lock to have 4WD.
If a tail shaft is removed all the drive will go to the end where the tail shaft is removed and there will be no drive to the end which is still connected to the tail shaft.
Locking the centre diff will allow drive to go to the connected tail shaft end as
well as the removed tail shaft end. This will allow the vehicle to be driven with one tail shaft removed.
Wayne
FollowupID:
663084
Follow Up By: Member - bungarra (WA) - Saturday, Dec 12, 2009 at 11:07
Saturday, Dec 12, 2009 at 11:07
Thanks Wayne....I was missing the plot on the constant 4WD...
cheers
FollowupID:
663086
Reply By: Bugs - Thursday, Dec 31, 2009 at 21:28
Thursday, Dec 31, 2009 at 21:28
Hi everyone.
Just a follow up on what has happened so far.
I replaced the uni joints on the front shaft and this did not cure the problem.
It seems it is the front diff causing the vibration as there is some movement in the pinion. This is not surprising as when I went to change the diff oil I was surprised that none came out of the drain hole when I removed the plug, and it seems that the oil had turned into grease due to grease mixing in from the CV joints due to bad or worn seals.
So anyone with an 80 series especially with full time 4wd keep an eye on your front diff oil levels or you will have the same problem as I did.
Thanks to all who submitted replies to my post and hope you all have a happy new year.
Joe.
AnswerID:
397122