Gearbox oil

Joined: 24 Oct 2002 Location: Brisbane, Nthsider

hey guys i am changing my gearbox oil tommorow in a bid to perhaps quieten it down a bit as lately it seems to have gotten noticeably louder. Ummm what grade/brand/qauntity shoud i be getting?

mike.

Joined: 26 Oct 2002 Location: Melbourne

OK I rarely talk about oils/additives as they can be a minefield and everyone has had different experiences.
These are mine:-
Bought Paj with 100K's on the clock, gearbox very notchy and 4x4 system had the dreaded (super select) flashing light syndrome.
Changed all oils (except engine) very soon after to Castrol and there was no improvement (it was obvious they hadn't been done in a long time).
Barry recommended Bimrose oil (Lim Slip 90) with Slick 50 additive.
http://www.bimlube.com.au/bl/brief_specs.html#Lim%20Slip%2090%20GL5+
We use this stuff at work and buy it in bulk as well as the Slick 50 so I did the gearbox, t/case and diffs. Within a week the gearbox notchiness had gone and after a few months the super select system was A-1. I have used this stuff ever since and am wrapped with it. It also freed up the lsd enormously before I got the locker. It costs around $7.00/ltr compared to around $3.50/ltr for mainstream oils.
I wreckon I'd have one of the smoothest shifting Paj boxes around and the super select lights virtually never flash (I've driven a few), 4x4 engagement/disengagement in all modes is first time every time.
With the motor I also had the tappet noise especially on cold start, dissappearing once she warmed up. I use Mobil 1 synthetic and dosed it with Slick 50 and after a few oil changes the noise virtually dissappeared. When it starts to come back (about every 10,000k's) I chuck in a bottle of Nulon Engine Treatment and this shuts them up.
It's done 155K's and hardly uses any oil or blows any smoke.
When I drop the oils there is no crud on the drain plugs (this took about 4 oil changes to achieve this).
Barry also uses Bitron diesel additives and de-carbonisers in his 2.8 turbo diesel Lux and it has to be one of the smoothest/quietest diesel Lux's I have ever seen (done about 280,000K's).
This is what I have done and it certainly has worked for my truck.

Joined: 03 Jan 2003 Location: USA

Cant argue with your experince Frank, because I wasnt there to witness it.

BUT... your active trac is controlled by vacume, and that servo on the diff. It really should have anything to do with the gear oil. I would say that your just got better from more use.

Joined: 26 Oct 2002 Location: Melbourne

Yeah Dougie I had it jump out of low range initially and when in 4x4 (centre diff unlocked) it was actually in 4x4 (centre diff locked). There was definitely a mechanical issue in the t/case.
But I agree these cases need constant use for them to work well.

Joined: 06 Dec 2002 Location: New Zealand

how often you should change your g/box oil diffs, whats a t/case

Joined: 22 Oct 2002 Location: Your Mummas House!

Julian_4x4 wrote:

how often you should change your g/box oil diffs, whats a t/case

julian, in a toyota, you probly changed yours when you welded the diff,. after river crossings, or whenever you are wroking on it, mine all got done, 5 or 6 times last year!

but i have mates that try to go for 10 years without changing the oils, as long as you dont drive in mud/water too much you dont need to do it very often

t-case, is a thing that bolts to your gearbox (thier is two sticks on the floor of your rig, the big one where you change when you are driving is your gearbox) the little gearstick, in your case a LN46 hilux (the pic in your avatar) the transfer case shift lever will be directly to the rear of your gearshifter, the short stick! the short stick on your rig goes straight into the top of your transfer case, it is a top shifted, 4 speed design! very strong, and allows the power and torqie to be transfered from your gearbox to either the front or rear wheels, or both together, to get your "4WD"

Julian if you have any more questions please start a thread in general 4x4tech, and let the mitsu guys have thier thread back Wink

thanks mitsu guys (and sorry about that)
bj!

Joined: 26 Oct 2002 Location: Melbourne

C'mon BJ no choir boy stuff..................................I do like abuse once in a while Laughing