FS5R30A rb25det neo 5 speed trans

[JC71]

new nissan FS5R30A rb25det neo trans for skyline er34 gtt. what is this large black "plug" in driver side of trans for?

Edited Monday at 11:38 AM by JC71

[GTSBoy]

It's where the speed sensor goes.

[JC71]

and if there is not speedo sensor from car to go there? just cap it off?

(its currently using a N/A ER34 GT /S15 style diff which has the speed/abs sensor built in front section of diff)

Edited Monday at 02:42 PM by JC71

[GTSBoy]

Well, yeah. But not with that nasty plastic cap. Well, actually it's a very nice plastic cap - given its job is only to keep the transport oil fill inside. But I wouldn't trust it to remain strong for years.

[Kapr]

Just to follow up on this. 

Will the speedo work with this? Like to have plugged speed sensor on this trans and still using one on diff from N/A (open) diff?

[GTSBoy]

If the current relationship is between the diff and the speedo, then no, you will not need a speed sensor in that hole in the gearbox.

If the car were an R33 GTST, or an R34 GT-T, then it would need a speed sensor in there. Because that's what those cars have/need.

If the car were an R32, then it will need a cable drive cobbled together from a Navara speedo drive, because R32s can't handle an electronic speed signal to the speedo.

[Kapr]

Yeah i have R34 with factory small box and now RB25DET NEO swapoed and iam planning to upgrade to big box. 

So i would be good as long as i do not change diff? 

[GTSBoy]

1 hour ago, Kapr said:

So i would be good as long as i do not change diff?

Yep. And if you ever do, you'll just have to deal with it then.

[Kapr]

Ok nice. And just one question. If i just change the inside of a diff to some type of LSD but the whole box/shell remain the same...it would still work? Or that inside/lsd gears would trhow of the signal?

[GTSBoy]

The "long nose" diffs in your type of car, that have the speed sensor on the snout, are a pain because the casing is different from all the other short nose diffs. This means that the pinion shaft inside them is longer, which can make it harder to do certain types of diff swaps.

But, if all you are going to do it swap the diff centre, and keep the gears (that's the crownwheel and pinion gears) then you won't have any problems.