R34 Diff oil

[drifter17a]

I had my car for over 10 years and done around few thousand miles but never changed the oil. thinking of changing it.

 

what brand and viscocity would you put in ? people seem to use redline shockproof in the diff

 

on  contraty seen others using atf dexron 2 or 3 so wanted to check. is it 1 liter?

Edited November 24, 2024 by drifter17a

[GTSBoy]

31 minutes ago, drifter17a said:

people seem to use redline shockproof in the diff

No. Well, some people "seem to use redline shockproof in the diff". Most do not. I would only contemplate it if you have badly worn CW&P gears.

And no. No-one in their right mind has ever put ATF into a diff.

Any normal diff/gear oil of the right viscosity will do. Whatever takes your fancy. Castrol, Nulon, Penrite, Redline MT range. Whatever. It's just gears.

75W-90 or 80W-90 is typical. I think that GL-5 is hard to avoid these days, although I think that a GL-4 is probably preferred, given the vintage of the equipment. At least Redline offer a number of GL-4 oils.

If you have a clutch type LSD instead of the VLSD, then of course you need a proper LSD oil. Anything from any of the same names above.

If you have a helical LSD, then it does not require LSD oil, and the recco is the same as for the VLSD. You don't want the LSD friction modifiers in the oil for a non-clutch type LSD if you can avoid it.

 

[drifter17a]

I believe mine is helical and not clutch type. During drifting one wheel was spining as if it was open diff so bought kazz 1.5 way and has sat on my shelf for the past 5 years as I want to learn shiming process and do it myself

 

in meantime thought I change the diff oil hence post here. So any 75-90?

 

i am pretty sure r34 are helical not clutch lsd as standard . That is gtt ones

[Kinkstaah]

99.9% of them are viscous diffs. The 0.01% are helicals. They were only option-able in the series 2, as well.

I have redline heavy shockproof in my helical. It seems... fine? I don't think anyone is ever going to know until something really breaks and at that point I'm not sure anyone will blame the oil. I just chose it because it's extremely heavy duty and my car will see not-road-legal duty for it. I've also had sadness with various diff oils in the past sweating out everywhere and/or other 'fun' things, with clutch diffs.

Given you have a 1.5 way on the shelf, I'd not even bother with the diff in the car and just get to tinkering with it. I would spend the $90 on oil toward the labor of someone else putting the diff in if time poor even lol.

[joshuaho96]

1 hour ago, drifter17a said:

I believe mine is helical and not clutch type. During drifting one wheel was spining as if it was open diff so bought kazz 1.5 way and has sat on my shelf for the past 5 years as I want to learn shiming process and do it myself

 

in meantime thought I change the diff oil hence post here. So any 75-90?

 

i am pretty sure r34 are helical not clutch lsd as standard . That is gtt ones

75W90 GL5 is fine. If you aren't sure about the type get one with LSD additive. 

[Duncan]

Only thing I'd add...is on recommendation from a good diff shop, I've used mineral oil in my diff including the race car for years. The synthetics can be too slippery and glaze the gears

[GTSBoy]

2 hours ago, drifter17a said:

believe mine is helical and not clutch type.

Unlikely, as per Greg's post.

2 hours ago, drifter17a said:

During drifting one wheel was spining as if it was open diff

This is not helical diff behaviour unless one wheel is up off the ground.

2 hours ago, drifter17a said:

I want to learn shiming process and do it myself

Shimming what? You don't "shim" a mechanical LSD. Probably not in the sense that you have heard of people "shimming" a diff. And the process that Nissan f**kwits call "shimming" a diff involves super-preloading a VLSD cartridge against the side of the diff to create a friction/wear point (in a place that it wasn't supposed to have one) to make the sloppy, useless, viscous diff into a hybrid viscous/mech abortion.

In case it isn't clear, I consider the process to be stupid.

2 hours ago, drifter17a said:

bought kazz 1.5 way and has sat on my shelf for the past 5 years

Nike.

[Kinkstaah]

7 minutes ago, GTSBoy said:

This is not helical diff behaviour unless one wheel is up off the ground.

Sadly I can confirm if you are actually seeking to drift, you will quite easily spin up one wheel. Even if you're going in a straight line. I am not entirely sure of the metrics/terminology here but there's only a certain amount that the helical will actually spin both wheels. I've seen it on video with my own car where two lines of smoke switch over to just one after you really get in to it.

Unlike with a clutch diff where you can keep your foot planted until the car regains grip, in my experience with the helical you want to be utilizing traction control allowing LIMITED slip or lifting (partially) when you start to spin up both tyres with a Nissan helical.

Which makes them pretty sub optimal for drifting duty. That said... this is probably a helical on numbers alone. Just put the Kazz in