Diff shudder :(

[anyfin]

Hello and all the best for the new year.

Advice on another newbie error.

We went to Fraser Island in July. Had a great time driving all over the Island which was a first for me in sand.

When we came off the Island there was a bit of a shudder from the rear of the wagon, a 2002 3ltr Patrol wagon, 230000 ks on the clock at the time.

Went to the car wash and gave it a good clean both on top and underneath to remove any sand and salt water residue.

Still had the shudder in the rear, mainly when turning tightly.

Drove home to Albury and contacted the dealer about the shudder the next day.

They replied that it would be sand built up on part of the drivetrain and that it would vibrate loose and disappear over time.

It did disappear almost completely and I almost thought it was right.

I towed our boat to Bermagui with 2 mates, going up Talbingo under heavy load and again around corners, the shudder returned.

One of my mates who ran his own mechanic shop for 30 years said , whats wrong with the diff.

Too cut the story a bit shorter, I booked the Patrol into the dealer when I got back from fishing, they discovered the rear diff breather had come off, drained the diff oil which was milky in color and said all could be okay.

At the next service I got the diff oil changed again but I still have the shudder under load, towing and tight corners.

1/ Have I done irreparable damage to the LSD in the rear?

2/ If so, do I a/ get it rebuilt, b/ buy a new one, c/ replace it with a locker, either electric or air?

I do not do any extreme 4 wheel driving, it was purchased to tow, having said that it will eventually be a mild touring vehicle towing a van of some sorts.

Guessing I would of done around 2.5 to 3 thousand kilometers with the shudder.

I had the truck serviced before we went, I did not do any daily checks at Fraser, I didnt trust my instincts when the shudder was noted, now I get to pay.

thanks

Doug.

[Sprock]

Hello and all the best for the new year.

Advice on another newbie error.

We went to Fraser Island in July. Had a great time driving all over the Island which was a first for me in sand.

When we came off the Island there was a bit of a shudder from the rear of the wagon, a 2002 3ltr Patrol wagon, 230000 ks on the clock at the time.

Went to the car wash and gave it a good clean both on top and underneath to remove any sand and salt water residue.

Still had the shudder in the rear, mainly when turning tightly.

Drove home to Albury and contacted the dealer about the shudder the next day.

They replied that it would be sand built up on part of the drivetrain and that it would vibrate loose and disappear over time.

It did disappear almost completely and I almost thought it was right.

I towed our boat to Bermagui with 2 mates, going up Talbingo under heavy load and again around corners, the shudder returned.

One of my mates who ran his own mechanic shop for 30 years said , whats wrong with the diff.

Too cut the story a bit shorter, I booked the Patrol into the dealer when I got back from fishing, they discovered the rear diff breather had come off, drained the diff oil which was milky in color and said all could be okay.

At the next service I got the diff oil changed again but I still have the shudder under load, towing and tight corners.

1/ Have I done irreparable damage to the LSD in the rear?

2/ If so, do I a/ get it rebuilt, b/ buy a new one, c/ replace it with a locker, either electric or air?

I do not do any extreme 4 wheel driving, it was purchased to tow, having said that it will eventually be a mild touring vehicle towing a van of some sorts.

Guessing I would of done around 2.5 to 3 thousand kilometers with the shudder.

I had the truck serviced before we went, I did not do any daily checks at Fraser, I didnt trust my instincts when the shudder was noted, now I get to pay.

thanks

Doug.

If the workshop told you "it's sand built up on the drivetrain & will vibrate loose & disappear " - I wouldn't let them fix my wheel barrow .
If it was mine - personally I'd be getting the diff centre rebuilt cos diff shudders don't get any better .


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[MudRunnerTD]

I would not take it anywhere near a dealer unless you want to take out a second mortgage. I would find a decent 4wd workshop and ask them to take a look.

I expect you have a H260 rear diff which is the bigger diff. before you spend upto $2000 on a locker or a rebuild I would ask someone to open it up for a look. This would mean taking the third member ( the diff centre) out and clean and inspect it. Before that even I would maybe take it to a diff specialist and ask them to go for a drive with you.

Once stripped you can determine f it's the LSD or the Crown wheel and pinion. If it's the LSD then swapping out for a locker may be viable or finding a second hand LSD might also work. It could be a uni joint?

A Dealer would not get a first look let alone a second look though.

[threedogs]

if you get under the patrol can you get any play by trying to move the tailshaft up/down.
Might be a collapsed pinion bearing,

[BigRAWesty]

Just thinking wouldn't a pinion bearing be an issue all the time instead of tight corners?
I'm with darren thinking it's possibly the lsd clutch pack.
If it is.. lokka time lol

[BillsGU]

Take it to Perry at Bullivant Automotive in Griffith Road. They are 4WD specialists and Perry owns a 4.2 GU so he knows Patrols. The other place in town in The CV Joint in Wodonga. They know their stuff as well.

[JME_GU]

So what was the cause of the shudder? I only ask because I have a 98 GU 4.5 with a 260 diff in it and it does the same thing. If you turn tightly and apply a lot of power it shudders, it typically does it in first gear, if I tow something it does the same but worse. There is no play in the uni joints, the pinion bearing looks fine, there is no whine from the diff so I figure it has to be LSD clutch pack.

[Jim Kay]

Had the same problem on same vehicle. Easily fixed !!!

Changed the diff oil and added double qty of Penrite Limslip additive - no more shudder when hot and/or on turns.

[abw]

I've just been doing a bit of reading about Patrol lsd. Re..lsd clutch pack shudder. Here's what you do. drain out 500ml~ of oil from your rear diff, add some Nulon engine cleaner (or different brand), drive for 1000klm (doing figure 8s on soft ground from time to time). fully drain and replace with 85w-140 limited slip diff oil. should restore diff.

[mudski]

Strange this. Since putting the new/ second hand centre in, i have noticed a rumble whilst turning and taking off. It will only last not even a metre before its gone... I've changed oils to no avail.