Jump to content
SAU Community

ER34 GTT Nismo GT LSD 1.5 Install Problem

GoHashiriya
 Share

Recommended Posts

GoHashiriya Community Regular

GoHashiriya

Posted
Posted

Hi all,

This morning I took the car to my mechanic to have a new Nismo GT LSD (38420-RS015-BA) installed and he's just contacted me with some issues regarding bolt sizing and flange fitment.

So far he's told me that the bolts that came with the Diff assembly are too small, 12mm vs the 13mm in the car already. And also he cannot get the flanges to fit correctly.

I should mention that the car is a stock 1998 ER34 GTT, however it came as a factory auto and had been swapped to a (cursed) R32 transmission. I wouldn't have thought the diff has been changed but who knows.

As far as the gearing is concerned, I'm certain my ER34 has the AT ratio for final drive as the acceleration is noticeably quicker than another ER34 GTT I've driven.

My question is, do you have any idea what may be happening here? I would have thought there would be no issues installing the Nismo diffs.

There's also the issue that he doesn't speak much English, and I dont speak much Japanese, but he's a nice bloke and has been very helpful so far and dont good quality work on smaller jobs.

Kinkstaah Grand Master

Kinkstaah

Posted
Posted

The rear ratio for AT is 4.08 vs 4.111 in Manual. This is utterly un-noticable. (about 1kmh per gear shorter/longer).

Do you really have a R34 GTT standard?

If any of the setup is to suit a N/A in the rear end, you'll have different axles to suit. If it isn't that - For some reason Nismo have two different part numbers for the R34, one for series 1 (98-2000) and one for series 2 (2000-2001)

The one you posted is series2. I am not sure what the differences actually are (or if it is even relevant.) But it is a different part number.

  • Like 1
tsuokun Apprentice

tsuokun

Posted
Posted

Something doesn't add up here.

My car is factory 1999 GTT A/T and it had the 13mm bolts. It had an VLSD.

So this makes me think that if the Nismo P/N really matches and the unit was brand new unopened, that something went wrong somewhere down the line at Nismo (highly unlikely of course). I suppose it would make more sense the other way around: the car had 12mm bolts it and Nismo came with 13mm.

About the flanges: I believe all Nismo LSDs come with the drive shaft ends/stub axles/flanges so unless they don't match the driveshaft bolt pattern (in ER34 this should be 5 in a star shape), there shouldn't be any problems with them.

Note that you cannot use the original VLSD stubs with the Nismo, probably the splines don't match and one of them is too long anyway, so if your Nismo LSD didn't come with the stubs, then no wonder there's trouble.

  • Like 1
GoHashiriya Community Regular

GoHashiriya

Posted
  • Author
Posted
2 hours ago, Kinkstaah said:

The rear ratio for AT is 4.08 vs 4.111 in Manual. This is utterly un-noticable. (about 1kmh per gear shorter/longer).

Do you really have a R34 GTT standard?

If any of the setup is to suit a N/A in the rear end, you'll have different axles to suit. If it isn't that - For some reason Nismo have two different part numbers for the R34, one for series 1 (98-2000) and one for series 2 (2000-2001)

The one you posted is series2. I am not sure what the differences actually are (or if it is even relevant.) But it is a different part number.

The acceleration sensation is subjective and if anything irrelevant anyway. 

The part number is correct according to the Nismo catalogue, along with the chassis number and Nissan EPC.

I did get an update that he managed to fit the flanges and have since picked the car up. However, he did use the original 13mm bolts. Unfortunately he didn't get any pics of the work.

He made a comment about how disgusting the insides were and that he was unable to clean up all of the caked oil. The car has about 240k kms on it.

 1973578787_NissanEPC.thumb.JPG.e01cbbde2bcddcf60b83ac4259071e08.JPG887267623_NismoGTLSDPartNumbers.thumb.JPG.23cdedc92b93326eddb2ae6dcf08a30b.JPG

1 hour ago, tsuokun said:

Something doesn't add up here.

My car is factory 1999 GTT A/T and it had the 13mm bolts. It had an VLSD.

So this makes me think that if the Nismo P/N really matches and the unit was brand new unopened, that something went wrong somewhere down the line at Nismo (highly unlikely of course). I suppose it would make more sense the other way around: the car had 12mm bolts it and Nismo came with 13mm.

About the flanges: I believe all Nismo LSDs come with the driv e shaft ends/stub axles/flanges so unless they don't match the driveshaft bolt pattern (in ER34 this should be 5 in a star shape), there shouldn't be any problems with them.

Note that you cannot use the original VLSD stubs with the Nismo, probably the splines don't match and one of them is too long anyway, so if your Nismo LSD didn't come with the stubs, then no wonder there's trouble.

I know right, luckily the mechanic was able to get the flanges in today - he told me it was super difficult - and I was able to pick the car up. However, he did not use the 12mm bolts that came with the diff. 

It is odd, and even if Nismo were to have made a mistake - again, highly unlikely - you'd have thought it would have been corrected this far down the line. Where the mistake lies and what I am going to do with these additional bolts, I have no idea. 

tsuokun Apprentice

tsuokun

Posted
Posted

Well, glad you have your car back on the road again.

I installed an S13 Kaaz 2way on my ER34 and just drilled out the diff centre holes to accept the bigger bolts. I also transferred the ABS rings from the ER34 stubs to the S13 5-bolt stubs.

Going to go Nismo at some point so this was good information. Need to check things carefully.

Cheers.

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Dose Pipe Sutututu
      Turn signal wiring question

      By Dose Pipe Sutututu · Posted

      Convert to dual filament bulb   FWIW, it will look odd - I dare say a bit dumb as it looks like your flasher relay has shit the bed.
    • GTSBoy
      Possible swap on R34 RB20DE NEO?

      By GTSBoy · Posted

      If the RB29 box in the car is a push clutch, then yes, you will need to deal with the pull clutch on the turbo box. You either buy a pull clutch and don't use the old one, or you do the things needed to convert the turbo box's clutch arrangement over to push. Which is a bit of a f**karound. "Making" a custom tailshaft is the easy part. But you will need to source the front clip yoke - the bit that goes into the output of the gearbox. These are not as easy to find. They are out there, but they don't grow on trees the way that they used to.
    • GTSBoy
      Turn signal wiring question

      By GTSBoy · Posted

      Indicator bulbs are way too bright to use as a "corner marker" (we call them parking lights too). Sure. Go ahead and do it. But realise that you wil need to come up with all your own wiring to do it, as no-one will have a standard howto worked out for Skylines. It's just a matter of abandoning everything that Nissan have done and starting from scratch. You'd probably be better off retrofitting tailght/brakelight globe bases into the front indicator housings and using the taillight circuit for your corner marker and the brake light as the indicator. You'd need to work out how to kill the marker circuit while the indicator is flashing, otherwise it won't flash on-off, just bright-less bright.
    • Kapr
      Possible swap on R34 RB20DE NEO?

      By Kapr · Posted

      Hi. A little bit of an update. It maybe(hope not) looks like i would need a new tranny(it would be "maybe" a cheaper or better option anyway) So i need some info. I know i need a different propshaft(i can make custom one) LSD is not a problem cuz the engine will be still(for now) N/A RB20. So if i buy RB25DET NEO tranny...is there something else i need? I read something about push/pull type but i do not know if i need to "change" something or i can just plug n play onto my engine a go? Thanks for the advice  
    • OakvilleGTR
      Turn signal wiring question

      By OakvilleGTR · Posted

      Good morning all, Bit of a random question but figured I’d finally throw it out after wondering for a long while. Before I start, I'm hoping to do this purely out of personal preference. I think it would look better at night, and don't mind at all spending a few hours and dollars to get it done. I've copied this from a non-Skyline specific forum, so I apologize for the explanation of our headlight switch setup that we all know. Here we go: Zero lights (switch off) Parking lights (switch position 1) being a rectangular marker on the outside of the housing, my low beam being the projector in the centre (position 2), and a high beam triggered by my turn signal stalk. Most North American cars I’ve owned of this era have power to the amber corner (turning indicator) light as part of the first switch (parking lights). I’d love to have these amber corners receive power when the headlights and parking lights are on (headlight switch), yet still blink when using the turn signal which is of course a separate switch. Hopefully I’ve explained my question correctly. Is anyone aware of a way in which I might be able to achieve this? Thanks in advance
×
×
  • Create New...