DIY: Transmission Oil Change

Akurei

Well i got everything besides the dang washers and they have to be special ordered or ordered online so itis just impatience. I suppose i will order some

Chuck33079

Order a bunch. The shipping will probably cost more than the washers, so you might as well buy a dozen and have a lifetime supply.

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juld0zer

i just did the tranny and diff oils yesterday. i wasnt well prepared so i didnt order any washers, i sorta did the diff and gearbox as a 'might-aswell' while i was doing the engine oil.

my only input at this point is that because the o-rings are not a snug fit around the core of the plugs, each time you tighten them down there is a chance you wont tighten it down on the same indentation as the previous. so you might not get a good/perfect seal. for this reason, i overtightened all plugs about 1/16th of a turn more. if the o-ring was more of a snug fit then id say re-using is fine without hesitation

on a side note, the Dimple magnetic drain plug i put on the gearbox did catch quite a lot of black particles. the diff drain plug came out black as expected.

SpeedLimit55

Very informative thread. Will probably be doing this soon since you guys have noticed smoother shifting.

forza370z

So if I change the transmission and rear diff all together, I will need 4 of those washers/gaskets correct?

I went on courtesyparts.com to order those. Guess what... those $2 washers will cost $12 to ship. That's ridiculous! Is there any other web sites to order these parts?

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Jsolo

If you're intent on changing those washers, just get 'em locally. They were $2.xx at the local nissan/infiniti dealer. First time I did mine I just reused the old ones on both trans and diff with no leaking.

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wdkwang

Unlike changing motor oil, the tranny and diff fluid isn't changed nearly as often. Perfectly fine to reuse the washers

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boosted180

Do you guys know where I can get the Redline MT-85 oil? Preferably locally? Autozone and other auto-parts stores don't have it.

1325

Red Line MT-85

90 ST

I used a Siphon pump the first time I did a oil change on it, but this time I made a pump kit, works way better, IMO used it for both the tranny and diff. I got a new clean pump from Starbucks, the ones they use for syrup, cut the tube down to fit, and drilled out the top of a Redline oil 1Qt. bottle. Done.
The pump end is log enough to go into the Tranny/Diff and you just push the bottle up and down. worked great!

bewhitey

I ordered 4 drain plug crush washers from that courtesy nissan link on the original post and it was $20.... I then looked at the bottom of the courtesy nissan page and it says "this part fits 350z and nissan leaf" doesn't say 370z anywhere. Maybe they are the same? maybe the website changed? I skimmed through the 14 pages of posts and didn't read anyone having a problem with them....

JARblue

Wow... that's like $5 per washer I get them for ~$2 apiece at my local dealer FYI.

As for your question regarding the washers, what is the Nissan part number for the ones you have? If it's the link above with Part # 11026-4N200, then you're good

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Jsolo

I've done the trans oil twice now. Both times reused the original washers and no leaks. When I do the diff this spring (2nd time), I don't plan on replacing the washers either.

For the engine oil yes because it's a compressible type copper washer, but for the diff and trans (6mt) I see little reason in replacing them unless damaged.

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LinPark

Ordered everything I need from Z1 recently and am planning to put it all to use this weekend. I had planned on doing this a few months ago and stopped in the Nissan dealership to pick up the gaskets and of course all they had was 1 in stock - I bought it anyway. I also got 4 from Z1 - here's a pic of both of them together:



The Nissan dealer part looks more like what is on the drain plugs in pics that have been posted in this thread and the DIY Differential thread. Should I seek out 3 more of the OEM gaskets or is it safe to simply remove the old one and go with the copper style Z1 washers?

Jsolo

Edit, looks like z1 is supplying copper washers in place of the aluminum ones. I've done my trans fluid twice now. Reused the washers both times.

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