75 series driveline whine.

Submitted: Sunday, Dec 06, 2015 at 20:52
ThreadID: 131058 Views:1719 Replies:7 FollowUps:3
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Hi all,

I've got a 94 1hz troopy with an early model 80 series auto fitted, both rebuilt 40k ago. It's also got the dts turbo.

After towing a car back from Sydney to the central coast I noticed a whine developed reminiscent of a old high km falcon taxi tranny whine. Only heard at lower revs but in all gears.

I have also noticed on the very odd occasion a clunking noise then a very abrubt but instintanious loss of momentum. Not sure if either are related.

My very rough guess would be something in the transfer case. Mainly because I've rebuilt virtually everything else on the car bar that which has bout 370k on it. The previous owner abused the car also.

Thanks in advance.
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Reply By: racinrob - Sunday, Dec 06, 2015 at 21:30

Sunday, Dec 06, 2015 at 21:30
After owning a 75 series for 18 years and towing a heavy 'van my first suggestion would be the transfer case, I had to rebuild mine every 100,000 ks and your symptoms sound very familiar.

Rob. VKE237 sel 6678
AnswerID: 593474

Follow Up By: rb30e - Monday, Dec 07, 2015 at 01:45

Monday, Dec 07, 2015 at 01:45
Cool thanks for that. They are a gear not chain type I'm pretty sure if that makes any difference.

Apart from the whine did you get the clunk/clashing and loss of drive at all?

What'd you pay to get it rebuilt roughly? I was planing on taking it out myself to save a little dosh.
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FollowupID: 861691

Reply By: Member - Phil G (SA) - Sunday, Dec 06, 2015 at 22:24

Sunday, Dec 06, 2015 at 22:24
Rear diff or rear wheel bearing?I have been caught out before thinking a noise was coming from the transfer when it was actually coming from the rear diff.
AnswerID: 593476

Follow Up By: rb30e - Monday, Dec 07, 2015 at 01:41

Monday, Dec 07, 2015 at 01:41
True, it most certainly sounds like front seat area if not further forward.

Wheel bearings have been done mind you I haven't checked the preload on them in ages. Did so after replacing though.

I put a locking centre in it and my diff bloke reckoned the carrier gears looked good. Dunno bout the pinion gear bearings though. Never really had to change them in all my time mind you this thing has some Ks on it.

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FollowupID: 861690

Reply By: swampy - Monday, Dec 07, 2015 at 02:43

Monday, Dec 07, 2015 at 02:43
hi
crown wheel and pinion noise either from current damage or previous
[collapsed pinion bearings ]
tailshaft spline wear
uni joint wear /notchy
bad wear on front axle bushes

new gear boxes were around 4000$
gearbox and transfer o/haul around 8-9 hrs [nothing major ]

swampy
AnswerID: 593486

Reply By: Member - mechpete - Monday, Dec 07, 2015 at 07:26

Monday, Dec 07, 2015 at 07:26
check the pinion flange nut ,
they only have to come very slightly lose an you will get wine ,if its too lose you will notice an oil leak at the pinion seal
cheers mechpete
AnswerID: 593488

Reply By: racinrob - Monday, Dec 07, 2015 at 07:26

Monday, Dec 07, 2015 at 07:26
rb30e.
I dropped and replaced the box myself and a mobile mechanic rebuilt it in my driveway ! He supplied all genuine parts and charged me $1k cash which I was happy with.
The clicking clunking you hear is bits off the cogs rattling around inside the case, eventually a gear will pick one up and do further damage leading to total failure like mine did at Flemington in peak hour traffic, with the van on.

Rob.
AnswerID: 593489

Follow Up By: mike39 - Tuesday, Dec 08, 2015 at 10:21

Tuesday, Dec 08, 2015 at 10:21
My hzj75 transfer case failed at 260000km. Spent 95% of that time towing an around 2t. van.
The heaviest loaded gear in the T/C is the idler gear, drive in and out.
The hardening on the idler shaft wears, rollers collapse and as racinrob says the noise indicates total failure is imminent.
If you only pull the back of the T/C, check the spline on the gearbox output shaft. The length of spline in the T/C input gear is very short, a gear with double the spline length is available.
mike
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FollowupID: 861783

Reply By: 2517. - Monday, Dec 07, 2015 at 09:45

Monday, Dec 07, 2015 at 09:45
Case hardening has come off the .bottom sharft and gone thought the box very common.
AnswerID: 593495

Reply By: Member - mark D18 - Monday, Dec 07, 2015 at 16:59

Monday, Dec 07, 2015 at 16:59
Had a similar problem with my 75 Troopy , thought is was the transfer case , but it turned out to be rear diff.
hope you find the problem soon

Cheers
AnswerID: 593518

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