A question for those mechanically minded.

Submitted: Sunday, Feb 22, 2004 at 21:38

ThreadID: 10712 Views:1451 Replies:6 FollowUps:7

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Shaun

Hi All,

I have a 99 hilux d/c petrol with 104600 kms. Over the last day or so I have been noticing a noise in the final drive area that sounds a bit like a grabbing or sticking noise. It started when reversing but now seems to make the noise going forward also, but only makes it when turning a corner with the clutch out and under load. My initial thoughts were the rear brake shoes were sticking so I pulled the drums off and there was no unusual wear on them, no leaky wheel cylinders etc and the hand brake seems to be releasing fully. As I siad it started off only when reversing around a corner but it is getting steadily worse and will now do it when going forward around a corner also. It also only seems to do it when travelling slowly (1st @ 1000 - 2000 rpm) but this may because I simply cant hear it any faster.
I have tried jacking both wheels off the ground and spinning them and the noise isnt there. Could it be a problem with the diff (LSD). I checked the diff oil and it is clean (4,600ks old) though I didnt drain it to look for metal.

Any Ideas before I take it too the mechanics?????

Shaun

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Reply By: friar - Sunday, Feb 22, 2004 at 21:49

Sunday, Feb 22, 2004 at 21:49

Hi Shaun
Was the oil lsd oil when it was changed,if not this could be your problem,hope this
can be of some assistance

AnswerID: 47628

Follow Up By: Shaun - Sunday, Feb 22, 2004 at 21:58

Sunday, Feb 22, 2004 at 21:58

Thanks Friar. Changed the oil myself and it is lsd oil (valvoline from memory).

Shaun

FollowupID: 309634

Reply By: Shaun - Sunday, Feb 22, 2004 at 22:04

Sunday, Feb 22, 2004 at 22:04

Friar you got me thinking so I went and checked - the oil was valvoline LS90, for LSD's.
Shaun

AnswerID: 47631

Reply By: donk - Sunday, Feb 22, 2004 at 22:39

Sunday, Feb 22, 2004 at 22:39

Shaun

The first thing i would do is drain the rear diff & replace the oil (dont use anymore of the same in case it is incorrectly packaged & preferably a different brand as well) & see if it makes a difference

Regards Don

AnswerID: 47646

Follow Up By: Shaun - Sunday, Mar 07, 2004 at 16:39

Sunday, Mar 07, 2004 at 16:39

Don,

Had the hilux checked out by a mechanic up here in Townsville (Rawnsley Auto's) - they drained the diff oil and replaced it with prolube 85/140 and no more noise - I'll be sending valvoline a nasty letter.

Shaun

FollowupID: 311254

Reply By: Member - Bradley- Monday, Feb 23, 2004 at 10:33

Monday, Feb 23, 2004 at 10:33

sounds like common old diff shudder from the lsd centre, change the oil straight away and use a high quality lsd oil ( synthetic preferred ) should solve it straight away.Just killin time till easter...............go and play in the dirt, instead of workin in it......

AnswerID: 47689

Follow Up By: LBJ - Monday, Feb 23, 2004 at 11:45

Monday, Feb 23, 2004 at 11:45

I agree Bradley, possibly even a pinion bearing noise aswell..........
Shaun, does the noise still appear when there is no load?

FollowupID: 309679

Follow Up By: Shaun - Monday, Feb 23, 2004 at 20:28

Monday, Feb 23, 2004 at 20:28

Never heard of ' common old diff shudder' - what causes it? The speed at which it (the noise) has deteriorated makes me think it is more than something from normal wear and tear, but I may be wrong.

Is this common in vehicles that have travelled 104,000 kms, with realistically very little 'hard' off road work.

Shaun

FollowupID: 309725

Follow Up By: Shaun - Monday, Feb 23, 2004 at 20:31

Monday, Feb 23, 2004 at 20:31

LBJ it only seems to appear when the vehicle is under load ie 1st gear light accelleration when turning a sharpish corner or roundabout, or reversing around a corner.

Shaun

FollowupID: 309726

Follow Up By: Member - Bradley- Tuesday, Feb 24, 2004 at 10:25

Tuesday, Feb 24, 2004 at 10:25

what happens is that the limited slip centre 'grabs' and releases repeatedly instead of slipping smoothly, hence when you go around a corner the differential wheel speed causes the movement in the diff centre, but under more power the centre is slipping ok. Because you just changed the oil and it happened straight away, then look at changing to a different oil with a high level of additives. Shudder can happen at any Ks, my new work ute shuddered from 2K until 8K when i changed the oil myself, put F.u.c.h.s. gear syn 75w140 full synthetic in and within driving 10 ks down the road, problem solved.Just killin time till easter...............go and play in the dirt, instead of workin in it......

FollowupID: 309782

Reply By: Penguin - Monday, Feb 23, 2004 at 11:07

Monday, Feb 23, 2004 at 11:07

Shaun,

You don't say whether the noise comes from the front or rear. Have you checked the CV joints on the front? They'll usually give a metallic clicking noise when they're worn.

AnswerID: 47695