100 series gearbox whine? or trasnfercase?

Submitted: Thursday, Apr 17, 2008 at 07:13

ThreadID: 56717 Views:7792 Replies:3 FollowUps:11

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rooooboy

HI all,
Recently purschased a Standard 100 series 99 model, knowing that the gearbox or transfer case has a whine. done 152km non turbo 1hz diesel. notice it more at 1ookm/h hour and back off. as soon as put foot on clutch it goes away.

have herd standard 100's have lighter gearbox? r150 or something.

was considering, change out from wreckers and fit hevy gearbox mabye. or rebuild ??

also thought is it transfer case? how do i determine that?
any adivce thanks

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Reply By: Peter 2 - Thursday, Apr 17, 2008 at 07:27

Reply By: Top End Explorer Tours - Thursday, Apr 17, 2008 at 13:27

Thursday, Apr 17, 2008 at 13:27

That sounds like a diff whine to me, time to replace the crown wheel and pinion, and put a bearing kit through it.

I have a ST 100 series and the gearbox is fine at 265000km but the dif had a rebuild at 200000, if it happens when you back off I would bet money on the diff.

I had the same happen in a troopy and one of the GXLs as well all diffs.

Cheers Steve.

AnswerID: 299002

Follow Up By: Top End Explorer Tours - Thursday, Apr 17, 2008 at 13:48

Thursday, Apr 17, 2008 at 13:48

Just to clarify, If the noise stops when you back off this would indicate the load being taken of the crown wheel and pinion therefore no noise, I you backed off and the noise was there this would indicate the bearings catching up on them selves and that noise would be consistent with a gearbox.

Cheers Steve.

FollowupID: 565181

Follow Up By: rooooboy - Thursday, Apr 17, 2008 at 20:14

Thursday, Apr 17, 2008 at 20:14

hi,
i notice it more when i back off but as soon as i put my foot on clutchh noise goes away instanttly.

was going to try and but it in neutra att 100km'hr see what hapens to noise with foot off clutch.

FollowupID: 565231

Follow Up By: Top End Explorer Tours - Thursday, Apr 17, 2008 at 20:34

Thursday, Apr 17, 2008 at 20:34

I spoke with the boss when I got back from lunch and he agrees it's the diff.

The reason being is, when you back of or take your foot of the clutch, the load on the crown wheel and pinion is released therefore no pressure on the gears, that means no noise.

Think of it like this,the gears in your gearbox run on a shaft, they spin on a bearing so if the bearings are gone, as I said the noise will be constant with or without you backing off,as the noise will be the bearings catching up, the diff is driven by the pinion spinning and driving the crown wheel so the pinion is forcing the crown wheel around, so when you back off the pinion backs off and just spins without pressure you put your foot down again and the pinion picks up the crown wheel and makes the noise again, because it is back under pressure.

Take it to a specialist and if I am Wrong I will pay for your membership to ExplorOz, thats how confident I am.

Cheers Steve.

FollowupID: 565238

Follow Up By: Member - Hughesy (NSW) - Thursday, Apr 17, 2008 at 21:05

Thursday, Apr 17, 2008 at 21:05

I'll back what Steve is saying - it will be the rear diff (I'll go you halves in the membership steve if we're both wrong;).

I have a 01 Standard HZJ105 with 275000km and it has the exact noise you describe - that is a whine not a rumble.

Unless its really bad I wouldn't be too worried. Just start putting $100 a month away and after 6-7 months buy a recon diff centre and swap it out. I haven't even bothered saving yet ;)

FollowupID: 565246