Just a recommendation to you all... (diff fluid change)
 

Get your rear diff fluid changed.

So today I had my rear diff fluid changed out to redline fluid, and the crap that came out of the rear diff was just plain bad. Ive got 1700 miles on my car and the oil looked like it had 100000 miles on it. I noticed after somewhat spirited driving, there was always this light burning smell, nothing too bad, but definitely a little noticeable. I dont really notice any difference in driving/performance but it gives me peace of mind that I no longer have a crud filled differential.

? ill get mine checked

I did this because a lot of other people changed out their fluid and theirs was disgusting. I had the same outcome. Just takes two quarts of 75w-90 gear oil and you're set.

this only applies to those with the sports package right?

No, we all have rear differentials, the sports package just has a limited slip differential.

I changed mine at 2000km's and it was putrid. Full synthetic in there now and I feel much better. Almost at 20,000km's now so I will change it again soon.... just to be safe!

Not all of us :stirthepot:

:icon17:

I STRONGLY back this recommendation:rofl2:

Thanks, I'm around 35K and its never been done...

The LSD clutches leave some particles in the fluid. Not sure it'll really matter as it'll be dirty again in short order if you get on it a lot. Same thing in my Challenger.

Z has a sealed viscous unit.

So no clutches? Interesting. Manual state to change at 30K ?

I take it no friction modifier is required? I need to read up on that.

Where'd you pick up your transmission oil? and are you sure it only takes 2 quarts?

the rear diff only takes two quarts, the transmission oil you dont need to touch for awhile. Not sure how many quarts of transmission oil you need.

Thats a typo, sorry I was talking about the differential. Where'd you get your oil?

Just got it from my mechanic.

well, that really helps me... :roflpuke2:

The internet is a good resource.

Yeah, I was just hoping maybe someone new of a place to get Redline for a good price. The good thing is the differential only takes 2 quarts, instead of 3. I found it on ebay, 3 quarts for $48 shipping included.

Got mine on amazon.com 13.95 a qt. did my 370 and gf's 350 . 4qts. $55.80 with free shipping

I've definitely been meaning to change my tranny oil. Shifts are way too notchy for a new vehicle and it's much worse in the cold. Always remember to make sure you can loosen the fill plug before you drain the tranny and realize you are f*cked. The diff is something I'll also look into, great suggestion!

Thanks man.:tup:

Is there a DIY fora 7AT diff change?

Edit: Found this link:

http://www.the370z.com/diy-section-d...il-change.html

Thanks for posting this.

You asked me where i got mine and i told you. And jomer is a great resource as well.

Yeah, Jomer is the man.:tup:

UPDATE:

I changed my differential fluid this morning at 3500 miles, everything was easy until I had to fill it up. The filler plug is not in the best location, and gravity is definitely not on your side, but a trip to Advance Auto Parts and a $10 filler pump worked very nicely.

I used Mobil 1 75W-90.
Good stuff!

just did mine @ 59k, and the oil was surprisingly a dark honey color, rather than the black sludge-ish description everyone else had. used valvoline synthetic blend 80w-90. never used this brand before, but only did because all the other weights were 75w-90 or something else, and the 09 manual calls for 80w-90.

Glad I swapped out my diff (entirely).

Thanks for posting. I'll get mine done as well.

370Z VLSD Differential
 

I don't think so. The VLSD clutches (in the Sport Pkg.) are sealed and do not put particles into the differential gearing. The VLSD clutch is Viscous coupling - not conventional clutch discs. This is what I've recently read anyhow. Also, the VLSD diff. should not require "friction modifiers" if I understand correctly.

Anyone, please correct me if I'm wrong.

I would also highly suggest adding this along with your oil..the stock diff cover has a very small capacity and the diff generates a lot of heat.

If you go this route with the Z1 cover and are also installing upgraded diff bushings, I suggest opting for the Whiteline bushings over the Energy Suspension bushings. The ES bushings have a little collar that faces the front of the car that obstructs the diff from seating in proper position to install the side bolts. Z1 has assured me that it is possible to "squish" the bushing in far enough to fit the diff with the upgraded cover, but I put all my might into it and could not accomplish this feat. Further, it seems like an improper installation of the bushing to me. By comparison, the whiteline bushing goes in very easily.

I do not have experience with the Z1 bushings, but I gotta believe they'll work properly with the Z1 cover.

Btalont: thanks for the information and pics - looks like a good upgrade.

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