Thanks Duncan3. Ive just jacked up the car and pushed and pulled (the wheel)..... No movement what so ever...... just a horrible sort of whiring noise especially when the car is coasting. The noise stops when under acceleration.

Hi,

The spin test you are talking about would ensure that the wheel bearings are not to tight, by the backlash once the wheel stops(generally only used as a final check when adjusting wheel bearings). To check the play(looseness) in the bearings(which would cause a horrible vibration through the car once at high speeds, somewhere over 70km depending on how loose the bearing is), you need to jack the rear up the same but push the wheel in towards the diff and back out towards yourself, do this continuously with pressure about 3 times. If there is play you will feel the wheel move slightly between the bearings..

It sort of comes down to whether you want to baby the gears or syncros.... Wearing either will cause you to need service... syncros are cheaper...

mostly what you notice is it doesn't act as much like a syncro box as it should, but still works good...

hehe this is also probably the first service in like 200,000 miles... american bearings and gearboxes don't last anything like that long...

Well as I said the spin test came up negative . This arvo I managed to get the inspection/fill nut off. The pinky came out covered in oil. Soooo..... in a way that is good that there is oil there. There are no clunk type noises so I can only assume that I need to pull it down and replace the carrier bearings.

Ive have redline 80W140 diff oil in my locked diff and 2/3 redline shockproof gearbox oil (75W90) in the gearbox with 1/3 atf fluid which acts as a detergent to stop glazing syncros, or so I have been told thats what it does.

Yea that I think is why the guy said I must use 85W 140. It is for the 1400 "bakkie" here in South Africa that naturally carries freight and also I think it is because we have a very hot climate in summer.

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That is also why I think our Datsun gearboxes must rather use GL4 oil. Currently my oil is GL5 and that is also why I want to change it as soon as possible.

when i had my h165 lsd rebuilt i had everything done to it like all new bearings, gears lapped and balanced, all new seals and that took the noise away. it ended up costing me $600 aus$ but i had plenty of freight on it to get it to sydney from bathurst.
i took it to a local shop and they said that it was that bad that they had to send it to sydney to get it all lapped and balanced by some of the better guys/specialists
as for oils i use a 75-90 valvoline durablend in both me gearbox and open diff. but castrol lsx 90 in my lsd
hope this helps

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Trav,
I supplied a new NOS ring and pinion (about $125 here in the US) and found a shop that specializes in diff repair. They charged me $300 usd for parts and labor.

About $425 total, and the car is QUIET going down the road now.

There are plenty of diff oils to choose from depending on driving conditions, outside temperature and personal choice.

Driving conditions mainly affects vehicles towing heavy loads or work utes loaded up.

Temp involves weather you live in Hot darwin or cold old Tazzie etc.

Standard every day diff oil is about 85w90. If you live in a very cold envoirment you could go for 75w85 or 75w90.

If you have a loaded up work ute or towing very heavy loads long distances or live where its very hot then maybe go up to the 85w140. This is a very thick oil and if you have a worn diff it may prolong its life till you can afford to rebuild it.

Personal choice is just that and how large your wallet is. Synthetic or Mineral based, Home brand to Name brand 20 bucks for 4 liters or 30 bucks for 1 litre. Knock yourself out. Me I just use the standard S#@T we have at work Mobi Lube 75w90 cause its FREE.

Also be carefull using some diff oils in gearboxes. Some APL GL5 oils are not too friendly to the brass syncros in gearboxes. Best thing to do is decide on the brand oil you want to use then go to that manufactors website or google the oil you want to use and research its charictaristics. Most have a help line phone number on the bottle as well

Hmmm yr right 85-140 does sound thick!! I,ll have to check out my spec book on datto,s...