vxr8 gearbox and diff fluid change

[vxr2010]

As above , has any one carried out both fluid changes , is it worth doing ? does it need doing ? i tried looking on line there apppeated limited info , i heard fluids for both are very specific ? car is an ls3 ve2 maloo on 40,000 miles , cheers in advance of any replies

[mfp4073]

At 40,000 miles I would definitely change the diff oil, if it's anything like a Monaro diff I'm surprised it's not clunking, either way it's past its best.
I'm not sure about the grade of oil for your diff, but I've settled on a Castrol Synthetic 75/140 grade and it's absolutely fine, but you might still need a friction modifier if you have a standard diff.
I have used Royal Purple in the past but I'm not too sure about that brand for a differential application, however I have continued to use Royal Purple for the engine and gearbox without issue.

[vxr2010]

cheers for the above , i have a monaro too but the gbox and diff are very different fluid wise etc , any one else with a vxr8 who has fluid changed as per above please

[breakdown]

the vxr8 needs to be changed at 60000k at the latest. Stewart at AAS Newcastle did mine last year when I was down at a meet. Mine was overdue but diff and g/box fine. Not cheap but use their Purple oil. Different viscosity for g/box and diff.Hope this helps.

[vxr2010]

No prob cheers for above

[jon1bc]

Standard T56 Gearbox = Dex 3
Standard differential - Castrol Bot 720 aka Castrol SAF carbon Mod Plus

Don't use anything else and don't use any friction modifier

[vxr2010]

I think it’s a 6060 box rather than a t56 i don’t know if that makes a fluid difference at all ? diff will be the same as far as i am aware

[mik_ok]

Castrol BOT720 for the diff as stated above. You need about 1.5l so will have to get 2 bottles.

Land Rover use this in some specific diffs so I got mine cheap from them. Changed mine at about 20k miles when the diff was no longer locking up properly, but it didnt fix the issue.

[jon1bc]

I changed mine for the first time 4 years ago when my diff made the odd clunk with TC light when reversing near full lock. It solved the issue and I've since replace mine every 2 years.

[99PBATR]

Is Castrol Bot 720 aka Castrol SAF carbon Mod Plus recommended for a Monaro diff as well (standard diff)?

[vxr2010]

Monaro diff is very different , there is a castrol fluid that i put in mine that made it a lot better and quieter

the post is under
Which Diff
my reply to it was as per below

I’m assuming you have tried changing the diff fluid , castrol syntax lsd 75/140 totally stopped the clunk in mine and quietened down the whole drive train , monaro diff clunk is very common but easy enough to solve for about 30 to 35£ or so plus it’s an easy job to do

[99PBATR]

vxr2010 said:

Monaro diff is very different , there is a castrol fluid that i put in mine that made it a lot better and quieter

the post is under
Which Diff
my reply to it was as per below

I’m assuming you have tried changing the diff fluid , castrol syntax lsd 75/140 totally stopped the clunk in mine and quietened down the whole drive train , monaro diff clunk is very common but easy enough to solve for about 30 to 35£ or so plus it’s an easy job to do

Thanks for the advice much appreciated, as its a job I am about to carry out and I wanted to make sure I got the right stuff. I assume standard LSD doesn't need a friction reducer?

[vxr2010]

If you use the castrol as above you don’t need any other additive , you will be surprised how much things quieten down

[selym]

vxr2010 said:

If you use the castrol as above you don’t need any other additive , you will be surprised how much things quieten down

Exactly this - my experience too.

[bigwheel]

Does the diff still lock up?

[vxr2010]

As far as i aware yes , i did a little burn out to find out, there were marks where both tyres had been , my cv8 is around 320 at the wheels so around 420 bhp and i’ve had no issues and all appears to be working as it should be , maybe a supercharged monaro can have an input as to locking but on n/a it seems to work fine , just so much quieter

[vxr2010]

As far as i aware yes , i did a little burn out to find out, there were marks where both tyres had been , my cv8 is around 320 at the wheels so around 420 bhp and i’ve had no issues and all appears to be working as it should be , maybe a supercharged monaro can have an input as to locking but on n/a it seems to work fine , just so much quieter