Jump to content
SAU Community

Gtr Rear Diff/axle/uni Joint/brake Conversion Into Rs4

CruiseLiner
 Share

Recommended Posts

CruiseLiner Mentor

CruiseLiner

Posted
Posted (edited)

hey guys well ive been getting a fair few PM's regarding the gtr diff conversion and change over to gtr axles, unijoints and brakes so heres a basic rundown for anyone interested in the work involved...

1. remove stagea diff, axles, rear hubs, coilovers.

2. put gtr diff internals into stagea diff housing so all mounts for attessa pumps are the same and it looks stock from the outside. the stagea and gtr diff housings are identical except the mounting points mentioned. i would take it to a diff shop once internals are installed and get them to check the tolerances on the gears so it doesnt clunk when on and off the throttle.

3. now the backing plates are different on gtr to stagea so its up to u which way u go, i know the gtr one has more capacity for betting cooling and also its aluminium and has fins on it . the gtr backplate just hits the rear x-member so u need to bend abit of the metal on the bottom of the x-member to allow clearance, its only touching by 3-4mm so its nuthin major to alter the x-member with some vice grips etc.

3. install gtr diff into the car

4. gtr axles are too short so they are useless, u will need a gts4 long side axle for the short side of the stagea (left and right axles are different lengths), and then another long side axle from a gts4 for the long side, but its still gonna be 40mm too short so u have to have it extended by a shop who specialises in that sort of thing. we actually did it at home with a welder and cut up one of the gtr axles and joined them where the unijoint area is closest to the diff, and i didnt think it would work or hold up to big launches, but now with 545hp at the wheels and about 8-10 8000rpm launches it is fine :)

5. u will need to use the gtr rear brake hubs as the splines on the gtr axles are different to stagea axles. these mount using all the stagea rear arms (all the gtr arms are too short). they all bolt up no problems, except the hicas mount on the hub u need to push the bush from the stagea hub into it (instead of the hicas balljoint bush). the bush is slightly small for the gtr hub so we used some shim metal around the outside of it to make it a tight fit. the stagea arm then bolts up as per normal.

6. the gtr brake rotors and hubs just bolt straight on and im 99% sure the stagea brake lines wont fit the gtr calipers as the fittings are different, so i used braided brake lines made up from a local shop.

7. your stagea coilovers wont fit on now as the bottom mountings are different and therefore u need gtr style coilovers (best to get 260rs ones as they are designed for the heavy weight of the rear end compared to gtr ones), i got the sydneykid coilovers so i just ordered gtr ones with a revalve suited for the stagea and they are fine, the top and bottoms both bolt up fine.

thats pretty much it from memory, and the only difficult part is the lengthening of the axle, but if a shop does it, it will be easy and not excessively expensive.

the drivers side axle is the one that needs lengthening!!!

thanks

Brad

Edited by CruiseLiner
fergo308 Rising Star

fergo308

Posted
Posted (edited)

I'll confirm point 6, the stagea rear callipers use a banjo,the (32) GTR callipers are a flared nut fitting. (32 GTR) fronts are the same deal,you need a custom line. I'm using a Z32 master cylinder,which gives a decent pedal. the std master is not sufficient.

Justin...

Edited by fergo308
darrinspencer Grand Master

darrinspencer

Posted
Posted
I'll confirm point 6, the stagea rear callipers use a banjo,the (32) GTR callipers are a flared nut fitting. (32 GTR) fronts are the same deal,you need a custom line. I'm using a Z32 master cylinder,which gives a decent pedal. the std master is not sufficient.

Justin...

I have just fitted a full set of R34 GTT front and rear brakes. Instead of buying more expensive custom lines, I used the factory R34 GTT rear brake line. It bolted up between the caliper and where it connects to the main body. I have also used the r34 booster and master as they look bigger than the Stagea.

captinsane Community Regular

captinsane

Posted
Posted
righto...so an entire GTR rear sub-frame will not fit because the track width (disk to dsk) is larger...correct?

bump...on topic...who can measure up both...i will try to measureup mine tomorrow

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

    • kevboost7
      Magnetic Drain Plug Snapped in Half

      By kevboost7 路 Posted

      Update: I got the magnet out. I bought 3 different flexible magnetic reach tools, but none of them worked. The magnet on the tip was all less than 2lbs of force, so i had to buy a special cylindrical magnet that had a pull force of 9lbs.  The magnet finally came in the mail yesterday, so i got under the car to get to work. The super strong magnet isn't that long, so i only have about 1 finger pinch lengths to hold it. I was so scared when i was going in the hole, that the 9lb magnet would just fly away inside the oil pan never to be seen again, but i had my butt cheeks clenched and finger gripped on that thing so tight, i managed to get it to suck the other magnet out.  It was a victory for me last night.         
    • MBS206
      New fix for low tyre pressure from bmw

      By MBS206 路 Posted

      Yep, pretty much what you said is a good summary. The aftermarket thing just attached to the rim, then has two lines out to valve stems, one to inner wheel, one to outer wheel. Some of the systems even start to air up as you head towards highway speed. IE, you're in the logging tracks, then as speeds increase it knows you're on tarmac and airs up so the driver doesn't even have to remember. I bet the ones that need driver intervention to air up end up seeing a lot more tyre wear from "forest pressures" in use on the highway!
    • sunsetR33
      Anyone know this frontpipe?

      By sunsetR33 路 Posted

      Yes, but you need to do these type certifications for tuning parts. That is the absurd part here. Meaning tuning parts are very costly (generally speaking) as well as the technical test documentation for say a turbo swap with more power. It just makes modifying everything crazy expensive and complicated. That bracket has been lost in translation many years ago I assume, it was not there.
    • dbm7
      New fix for low tyre pressure from bmw

      By dbm7 路 Posted

      Hahaha, yeah.... not what you'd call a tamper-proof design.... but yes, with the truck setup, the lines are always connected, but typically they sit just inside the plane of the rear metal mudguards, so if you clear the guards you clear the lines as well. Not rogue 4WD tracks with tree branches and bushes everywhere, ready to hook-up an air hose. You can do it externally like a mod, but dedicated setups air-pressurize the undriven hubs, and on driven axles you can do the same thing, or pressurize the axles (lots of designs out there for this idea)... https://www.trtaustralia.com.au/traction-air-cti-system/  for example.... ..the trouble I've got here... wrt the bimmer ad... is the last bit...they don't want to show it spinning, do they.... give all the illusion that things are moving...but no...and what the hell tyre profile is that?...25??? ...far kernel, rims would be dead inside 10klms on most roads around here.... 馃槂
    • joshuaho96
      Anyone know this frontpipe?

      By joshuaho96 路 Posted

      You're just describing how type certification works. Personally I would be shocked to discover that catalytic converter is not in the stock mounting position. Is there a bracket on the transfer case holding the catalytic converter and front pipe together? If so, it should be in stock position. 
脳
脳
  • Create New...