Hey guys, I’m currently finishing up my engine swap as my old engine spun a bearing, I need to add fluids back in and I was wondering if I use atf fluid for the transfer case as I have a 2009 g37X. I was also thinking of doing a drain and fill for the transmission but idk if it would be a good idea, wouldn’t want it to start slipping, any thoughts thanks?

 

Nissan Matic-J for the transfer case and Matic-S for the 7AT.
Drain and fill should be fine, but please make sure the follow the fill procedure exactly as written in the forum.
If you are over 100,000 miles (160,000Km) then i would recomend a drain and flush of the front and rear diff as well. Front and rear diff fluid: Genuine NISSAN Differential Oil Hypoid Super GL-5 80W-90 or API GL-5, Viscosity SAE 80W-90 or SAE 90W if you live in an area that never dips below freezing.

 

I agree on Matic-J for the transmission. I've performed fluid exchanges every 35K miles or so, but if the fluid has never been changed then the general consensus seems to be that drain and fills are a better option.

Note that if you don't want to lay under the car while it's running on jack stands or ramps (required to check the fill level correctly), the dealer performs the drain and fill for relatively cheap (only uses 3-4 quarts of fluid vs. the 12 quarts used in the exchange). However, the dealer doesn't drop the pan and clean the magnets inside.

I used Amsoil Severe Gear in the Diff and Change the fluid at 35K miles as well: https://www.amsoil.com/p/amsoil-seve...gear-lube-svg/

I like that it claims to control thermal runaway and control operating temperatures. I'm sure you'd be fine with the factory gear oil as well.

 

So today when I went to get my atf fluid from the Nissan dealer, they told me that they no longer had matic J and that matic S was just the new version of matic J, should I just use matic s when it comes to the transfer case too?

 

The last time I changed fluids, I got J from Amazon,. (At the time the nearest dealer was 90 minutes away)
If the dealer said S is good to go, then i wouldnt worry too much.

 

Yes the S is backwards compatible. They stopped making the J years ago.

 

Matic-S is what Z1 sells as well. No worries.

 

Z1 just buys their stuff from the dealer and then sells it to you. They're just the middleman.

 

But they sell at a 30% discount compared to the dealer.

 

Not all dealers charge the same price. Plus the shipping fees Z1 charges usually negates any savings.