Looking for a RB20 transmission

[CowboyZbop]

I'm hoping someone has a RB20 manual transmission in good shape they may have laying around.

I am from the States so I know that can be an issue for some but maybe someone hear may know someone from the states who may have one and pass the word around.

Thank you!

[GTSBoy]

Also RB25 NA box is the same thing. Slightly different ratios, but actually a better choice.

[CowboyZbop]

So I've read, but with this low hp application and the ability to use the stock driveshaft and mounting points of a Z, I'd rather keep it as simple as possible.

Pretty ironic when coming from my carburetor thread, right? haha

You seem to be real deep in this, spread the word if you can. Come up with a finder's fee!

Edited May 21, 2019 by CowboyZbop

[GTSBoy]

1 hour ago, CowboyZbop said:

but with this low hp application and the ability to use the stock driveshaft and mounting points of a Z, I'd rather keep it as simple as possible.

I'm not sure I follow. The RB20DET manual gearbox is physically exactly the same as the RB25DE. You unbolt one, bolt in the other.

[CowboyZbop]

I was under the implication that a different driveshaft had to be used for the RB25 unless it is referring to the RB25DET gearbox?

Either way, if true and I could use the stock 260z driveshaft with the RB25, RB25 transmissions are very hard to come by here. Atleast for a reasonable price.

[GTSBoy]

RB25DE gearbox is exactly the same gearbox as the RB20DET. The small frame gearbox.

RB25DET gearbox is much larger. It's the big frame gearbox that was used in Z32s, Nissan pickups (and the GTR, essentially). That box  would definitely require tailshaft modifications, although that is no problem. Every single person who has put an RB25 gearbox into an R32 here in Australia has carted the necessary parts off to the tailshaft workshop (usually Hardy Spicer) and had them cut and shut them together. Hardy Spicers have done it so many times that you don't even need to take measurements! They know the lengths off by heart. It's not hard.

I am very surprised that you think you can use the 260Z tailshaft against an RB20 gearbox anyway. I would have thought that the back end of the L260's gearbox would have been different to the RB20's.

[CowboyZbop]

It seems like all the way back to the Z cars that there is a lot of similarities in Nissans among the years. 

All this information on this I acquired from mostly hybridz forums. The guy who has to rework my oil pan for this swap also runs the stock driveshaft in a RB20. Many users seem to have done the same. 

[CowboyZbop]

https://forums.hybridz.org/topic/96103-240z-and-280z-mounts-and-drive-shaft/

One example, second post.

[GTSBoy]

Fair enough. But it doesn't change the fact that you have broader options for original source of your gearbox.

[CowboyZbop]

I don't think there is. It sounds like for my application there is only 2 options. RB20DE(T) gearboxes and RB25DE gearboxes. That's not very broad in my opinion. Like I mentioned before my eye would be on the more durable gearbox but they are very elusive here.

But I do appreciate where your posts are coming from. You were just informing me that there is a better option.

Edited May 22, 2019 by CowboyZbop

[GTSBoy]

There were a lot of NA Skylines, Cefiros, etc made with RB25DEs in them. There are many of these boxes still available in Japan. If you need one, don't be trying to look in the USA, where there will be almost none. Try looking at the source. Consider using Jesse Streeter or one of the other buying & shipping agents who live over there to get you one.