Are you able to reuse the drain and fill plug washers? I done other transmission fluid changes on other cars and they were fine reusing the washers and never leaked even though the manual says to replace them. However, i heard some manufacturers use crush washers on theirs. Is the 370z one of them?

The washers on the transmission are not the same type of crush washers that are found on the oil pan so you might be able to reuse them without issue but why risk an oil leak and a new tranny for a couple bucks worth of washers :confused:

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

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.

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.

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

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?

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.

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

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.

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!

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....

Wow... that's like $5 per washer :thumbsdown: 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 :tup:

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.