Jump to content
SAU Community

Choosing rear stub axles for diff upgrade

CowsWithGuns
 Share

Recommended Posts

CowsWithGuns Enthusiast

CowsWithGuns

Posted
Posted

Hello friends,

The other day I snapped an axle and have been thinking about upgrading diffs. Spent a few hours trawling through and have settled on upgrading to a nismo 1.5 way for my daily r34 gtt (I have no hopes for finding a nice helical from an s15 or late r34 any time soon, and if I'm gonna spend 1k+ on a centre it might as well be the 'best' one). Naturally I could go with 38420-RSS15-B5, the default for the r34 gtt, however; since my axle has snapped and I haven't sourced a replacement yet (seeing them $600+ second hand - gross!), I was wondering if theres a particular stub axle with readily available/cheap axles from newer nissans (e.g. 350Z) that are as strong or stronger than the stock r34 ones.

This option has broadly complicated things as I wouldn't know where to begin with determining what shafts have what bolt patterns/lengths to fit my car, so I was hoping someone has some pre-existing knowledge to share.

While I'm at it, it's a mystery my axle broke spontaneously (admittedly during a pull). The road was wet, and I only only push 230kw at the moment - any reasons why it might just give up and die like that with my relatively weak car and poor traction conditions?

robbo_rb180 Grand Master

robbo_rb180

Posted
Posted

What bolt axle do you have 2x3 or 5x1? 5x1 is the better design.
How low is the car and what angle are the axles at? 
What was the condition of the axle? plenty of people running the standard gear with a lot of power & semi slicks.

Best upgrade is the 350z but will require a diff swap and I think a hub swap to suit the outer splines similiar to gtr.

 

CowsWithGuns Enthusiast

CowsWithGuns

Posted
  • Author
Posted

I've got the 5x1. The car is lowered a fair bit - I see your point here. No idea, the cars seen a lot of action from the prior owners and lately from me so I guess it's a given eventually it wears out.

Regarding the 350z setup. I'm not down to go to the ~3.5 ratios the 350z runs. Currently I'm stock at 4.11, lowest I'd consider is 3.8. Getting a diff setup between 3.8 and 4.1 that accepts 350z axles and has a fully functional LSD (helical or mech) would be the dream. I have more research to do, thanks for your input.

CowsWithGuns Enthusiast

CowsWithGuns

Posted
  • Author
Posted

Couldn't edit my post, sharing my discovery here:

https://www.leesonengineering.com.au/blog/r200-350zgtr5x1-stub-conversion/

This mob will convert your stubs to accept both 5x1 and 6x1 patterns. With this option available down the track, I'm going to go with the recommended nismo LSD for my car which will come with 5x1. I was considering trying to get something with 6x1 stubs to 'future proof' my drivetrain but couldn't figure out whether the diff centres in those kits would be different or not, risking fitment issues with my diff housing.

GTSBoy Grand Master

GTSBoy

Posted
Posted

Balance almost certainly not important at that mass, diameter and location in the drivetrain. Balanced probably better, sure, but I'd be willing to bet the resulting vibrations from being left as is would be undetectable without reasonably precise gear.

Once thing I don't love is the vert close proximity of 2 of the holes. Not a lot of meat there. I know the flange to flange contact is still mostly there, but there would be a reasonable section of the axle's flange that overlaps the really close stub flange's hole - right where you would want to be transferring load. Again, probably about as important as the balance issue, but it still irks me.

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

    • The Bogan
      NC MX5

      By The Bogan · Posted

      I transferred from full time service to Army Reserve, so I still have access, work has been super keen to get me in to work in the OPS realm, so just turning up to use the gym......and ovens, isn't causing any issues, apart from me needing to keep on telling them that I won't be doing any reserve days until I get my joint in Goulburn sorted  Basically I can now work whenever I want, for how long I want now, and it's all tax free Next time we have some fires or floods you might see me covered in mud, or cutting sick in some plant equipment cleaning up, the Reserves love getting in the news, LOL
    • The Bogan
      NC MX5

      By The Bogan · Posted

      Final finish outcome of 80°c was typical to the pics, I've turned the oven down to 50°c and will pick them up after the gym tomorrow  The before and after difference was amazing, the wrinkle paint has covered all of the casting marks completely It did take a couple of hours to key it all and get in all of the crevices, but, for me it was time well spent for the final outcome, but I have all the time in the world to do it at the moment  Ended up with 4 coats, each sprayed at different angles to get optimal coverage and thickness As for the fixtures and intake box thingo that hasn't made it, the supplier is apparently posting the fixtures, and, are now sending a different CAI that is in stock The replacement CAI is actually better than what I originally ordered, but will require a pod filter that locates under the front bar, still serviceable, but it basically removes the whole OEM filter box and ducts into the front bar, so filter cleaning will require ramps and the removal of some front bar undertray, not a war stopper, just some ramps and an additional 10 minutes work every few months From looking at it it is made from alloy pipe from the throttle body, through the CAI hole in the rad support, then right turning under the bar, luckily the wrinkle paint was on special and I got 2 cans for $30ish, so the alloy will get the same wrinkle treatment as the intake manifold, hopefully it turns up soon, either way, the car will be getting booked in soon, if the parts aren't here, I'll just get MX5 Mania to " make it work"  
    • MBS206
      NC MX5

      By MBS206 · Posted

      I'm so glad base security is so high. I see they stopped some random codger from being able to just wander in off the street... 😛   PS, intake looks good!
    • The Bogan
      NC MX5

      By The Bogan · Posted

      So far so good, another hour and their done
    • RA708
      Is there a good place to learn how an engine works online?

      By RA708 · Posted

      Exactly how each part works and how they all work together to make the engine function. That's all I'd need to do a basic build. Maybe how forced induction works. I probably need to learn some of the maths behind it all as well.
×
×
  • Create New...