GT-R gear box swap

[S15_nz]

hi all, im very interested in getting a GT-R (R34) gear box put in my S15, its auto atm :S so i was thinking if i change the box i might as well get a good one. what i would like to know:

1. might be a stupid qstion but: will it be able to drift?
2. would there be any kw increase? if so how much?
3. how much would it cost?
4. would i also have to get a new ecu?

[grncivicdhr]

sorry i can't be of much elp to answer your questions, but how about posting picks of your s15? it would be cool to see one.

.....nevermind, you already did that. that is one beautiful car.

[wingsofwar]

You might want to post on the silvia Forum which is futher down the nissan list.

As for some of your questions;

1. its possible to drift in AUTO. Will you drift? that depends on your skill as a driver.
2. I dont believe you will get any benifit of adding any more power, since power comes from the engine, not the drivetrain.
3. Since the RB tranny is AWD (assuming you want the 6-speed) it might be difficult to change over from the SR20DET. modified bellhousing, disconnecting the transfer case, ect. Not worth the time and money put into it trying to make it fit.
4. if you do happen to get it fit, you dont need a ECU, only thing that really changes will be the ratios.

were there A/T in BNR34s?

feel free to correct me if im wrong.

[R.W.240]

Edit: Wings of war beat me to it... and his is better

[vsiev]

damn i didn't know they had a silvia forum...i should get out more lol

[S15_nz]

thanks for all the feedback guys! yeah ill forget about the gtr box, too much of a hassle, i just dont want the s15 6 speed because ive heard a lot of bad things about them, like thin gears and that they brake down. is this true?

also, is the s14 5 speed any good?

[S15_nz]

dam i did some research and theres loads of stuff saying that the s14 box is much stronger. i also read that the s15 comes with crap viscous lsd in the auto version

[SHO411]

Heard that S15 trannys are weak, will be better to go with the RB25 tranny, or if you still want a 6sp, get a T-56, they can handle upto 600lb/tq, Lingfelter vettes don't even upgrade the tranny what so ever. It is light, I picked up mine from the ground when I had it out of my Firebird.
All aluminum casing, must warn you, they do cost and they are HUGE, might not fit in the tunnel, not sure haven't gotten around to my swap yet.

[S15_nz]

thanks all, ive found a solution im getting a nismo 6 speed box, its great. and its only about 600 bucks more than a stock s15 box (new). mmh how much is it for a auto to manual conversion?

[wingsofwar]

I recommend looking into the HKS 6speed tranny for the SR20 as well, the gears are built like a tank and ratios are improved for wider tuning limitations. JGTC uses HKS GT spec tranny.

[nissanfanatic]

The problem with the s15 gearbox is that is was a five speed gearbox casing with six gears plus reverse jammed in it so some compromise was made. I.E thinner gears.