RB26DETT Questions/Transmission Info

[Dyl510]

hey guys, new here... seemed to have a bit of trouble when I originally posted this... a little confused, I don't exactly know what a "sticky" is. I don't use forums much, so in hopes this won't get deleted:

I'm looking to put an RB26DETT out of a 1992 GT-R skyline into a hot rod project of mine, but have a few questions before I decide to buy the GT-R for parts.

For starters, I would need to swap transmissions to make it 2WD, I'd imagine a 5spd out of a GTS RB20DET would do the trick? If so, would I need the RB20DET bellhousing to go with it? Or would it work with the bellhousing already on the GTR's RB26?

Also, I hear the transmission gearbox from the KA24 is the same as the RB20? I'd think finding one from a KA would be easier/cheaper than from an RB... but I'd also imagine the KA gearbox being weaker and not able to withstand the RB26's power (I plan to run appx 300-350HP).

Brings me to my next question, I know Nissan likes to keep it simple with parts interchanging, but with the 2WD transmission on the RB26, would the clutch/flywheel assembly be the same? or would that have to be swapped as well?

And last but not least, I hear so many horror stories of modded skylines and their computer issues, so I have to ask..... would the 2WD set up mess up the RB26's computer to any extent?

ANY info is greatly appreciated guys, thanks in advance.

Cheers, Dyl510

[Cjmartz2k]

RB20 transmission would bolt up to the motor just fine, but I think there is a little fiddling with it your going to need to do something having to do with the AWD sump. Now how long the RB20 transmission will live behind the RB26 is a different matter. A bone stock RB26, it'll be fine. I could see you popping one with a bolt on and boosted up stock turbined RB26 though. RB25 transmission would be a better idea though.

Clutch's from all the RB's are the same, except some of them depending on the year are pull type, and some of them are standard push type. '92 is right on the edge where it could be either IIRC.

2wd or AWD plays no part in the engine ecu. It'll be fine in that respect.

[ItzGenX]

When I begin my project, I plan on keeping the AWD transmission without a shaft going to the front. The front diff will be chopped n welded. I'll figure out how to make room for my transfer case. If full-race can fit that behemoth under the car, I figure it shouldn't be too bad. The picture of under the R14 doesn't seem like they modded the tunnel terribly or anything. It will probably be fine after a few blows with a hammer lol. I don't want to waste a totally perfect transmission that comes with the engine and buy a $1000 transmission that's virtually the same on the inside. Plus, if I end up shredding 3rd gear in it, I can easily find a new one for cheap since everyone doesn't want theirs .

[Dyl510]

awesome, much appreciated!

with the AWD transmission/transaxle setup on the GTR's, is it possible to run it as 2WD and just leave the AWD portion of it disconnected? I've got a feeling that would be a stupid move but it would save a lot of time/money.

thanks again.

[ItzGenX]

Yes you can just leave the transfer case disconnected from the front. The transfer case clutch is activated by hydraulic pressure from an external pump that the altessa system controls. If you do not hook any of that up, the transfer case will not even spin with the rest of the transmission under load. R32 and R33 transfer cases have no preload on the clutch at all, so it can free spin. R34 (Getrag box) has preload on the transfer case clutch and will burn out if the front wheels do not roll along with the transmission.

http://www.youtube.com/watch?v=xVpddjCH6cU

Notice that before he even pulls the clutch unit out of the transmission that he can spin it without the chain spinning too. Without any hydraulic pressure, the transmission will be stuck in RWD mode with 0% transfered to the front.