Getrag Owners Transmax Z Or Rp Synchromax?

[Levy]

Hey guys il be changing gearbox fluid soon. Il be using Castrol transmax Z in the Transfer case. I know this topic has been covered many times before. But i wanted to ask the R34 gtr owners (Getrag owners) what their thoughts and experiences are with both Castrol transmax z and Royal purple synchromax in the gearbox? Any differences between shifting smoothness etc.

I know how pricey and rare the Getrag's can be so call me fussy when i say id rather break 100 Rb26 motors than a Getrag gearbox haha

Edited February 9, 2015 by Levy

[Stixbnr32]

You can buy brand new Getrag/transfer case etc from nengun for $8.7k USD.

Try getting a brand new Rb26dett for that price.

In saying that use the fluid that Nissan recommends which is NISMO COMPETITION OIL type 2189E(75W140) 2L

Edited February 9, 2015 by Stixbnr32

[XKLABA]

I use RP syncromax in mine, DO NOT UNDER ANY CIRCUMSTANCE use a gearbox additive in a Getrag

Try buying the Nismo oil and see how much it is

[Levy]

You can buy brand new Getrag/transfer case etc from nengun for $8.7k USD.

Try getting a brand new Rb26dett for that price.

In saying that use the fluid that Nissan recommends which is NISMO COMPETITION OIL type 2189E(75W140) 2L

Good to know they still sell brand new. This is the first time i heard the Nismo oil. Il have to look into that. Thanks man

I use RP syncromax in mine, DO NOT UNDER ANY CIRCUMSTANCE use a gearbox additive in a Getrag

Try buying the Nismo oil and see how much it is

Would you recommend the RP synchromax? How many kms have you done with it?

[XKLABA]

I little over 10k and 5k of that is with 450+awkw including two trips to the drags, a day at SMSP-S and two hill climbs so far with two more at the end of this month

The RP Syncromax was designed for use in the Getrag, the Supra version which is nearly identical to the R34 one

[Levy]

I little over 10k and 5k of that is with 450+awkw including two trips to the drags, a day at SMSP-S and two hill climbs so far with two more at the end of this month

The RP Syncromax was designed for use in the Getrag, the Supra version which is nearly identical to the R34 one

Thanks for info. I think il give it the RP synchromax a go. Iv been using their engine oils for all my RBs without any problems. I guess there Gearbox oils should be just as good.

[Dahtone Racing]

Used that RP stuff and made the box shit house to drive, before that it had the old oil it in from Japan and copped a hammering with 750hp.
Tried to be good to it and put the "good" oil in it and it was worse to drive.

[Levy]

Used that RP stuff and made the box shit house to drive, before that it had the old oil it in from Japan and copped a hammering with 750hp.

Tried to be good to it and put the "good" oil in it and it was worse to drive.

Way to kill my confidence i just bought 2 bottles today

Il only be using it for the gearbox. Il be using Castrol transmax Z for the transfer case.

[Dahtone Racing]

Sorry mate lol

See how you go I guess, we ended up getting the box rebuilt and synchros were rooted but gears were immaculate.

[Levy]

Sorry mate lol

See how you go I guess, we ended up getting the box rebuilt and synchros were rooted but gears were immaculate.

Well im not running no where near that sort of power lol Cars still standard. So what oil did you switch back to?

[Dahtone Racing]

hasn't gone back in yet but Terry at Award Diff and Gear said just use Dex 3 ATF

[Levy]

Any particular brand? I know Castrol and Valvoline stock a Dex 3 ATF. Either way im interested to know how you go with it.

Edited February 11, 2015 by Levy

[Dahtone Racing]

I'll probably use Transmax Z in both the box and transfer.

[Levy]

Il see how i go with RP. If the gearbox doeant like it. I'll just use the Transmax Z

[XKLABA]

I have no issues with drivability with mine, it shifts perfectly fine

I use the RP stuff because when working the the BSM GTR team they had a group of oils tested after blowing a few boxes and the RP came back the best and they stopped losing boxes after changing to RP, though that was Gearmax in a PPG dog box

Post up how you go with the RP when you do it

If you want ideas on different oils look at the Supra sites, they have had the Getrag box a lot longer then us

[Levy]

I will keep you guys updated on how i go

[Levy]

Sorry about the late update guys. Finally ended up changing the the gearbox fluids. Already i noticed a big change in smoothness even while the gearbox is cold. Once its warmed up it just gets better. Before doing the change my gearbox felt pretty rough (no crunches). Especially at low speed shifts. Now it slips in beautifully

Like i said i ended up using Transmax z in the Transfer case and RP synchromax in the gearbox. Will see how long this smoothness last...

Edited March 1, 2015 by Levy

[XKLABA]

That's good to hear

I just did two days off hill climbs at bathurst , and had a issue on the first run on the second day while box was still cold, it crunched going from 4th back to 3rd coming into the Cutting, after that the box had warmed up and was perfect

I was talking to the Supra owner that was there about oil and he too runs RP without issue but mentioned the Getrag was designed for Dextron II which is a mineral oil, not synthetic , but you can't buy that anymore as it was superseded by Dextron III

[KiwiRS4T]

If you follow the tread on the same subject further down you will se that Getrag say to use the Dextron II because the seals do not like modern synthetics

Poster there is buying Toyota T IV which presumably fits the bill.

[Levy]

Just a quick update i havnt changed the the gearbox and tranfer oils since and have done roughly 10k. Its been through alot of hard street driving and occasional drags. And in the last 6 months iv been doing a fair bit of 2 step launches with the car making 340awkw. Gearbox hasnt had any issues since and still feels smooth at high and low rpms. Il be servicing soon and will be using the same oils