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DIY. How to convert a Skyline GT-R or GTS-4 to RWD.

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  • DIY. How to convert a Skyline GT-R or GTS-4 to RWD.

    first off here's the things you will need to change.

    1. oilpan
    2. transmission/slave cylinder
    3. driveshaft
    4. pinion yoke
    5. trans crossmember
    6. front axles
    7. attessa pump and system


    things not needed to be addressed or not really a walkthrough.

    ecu (awd is fine)
    wiring (just make sure your reverse sensor on the trans is wired up)
    speedo (rb20 trans works perfect. rb25 has to be modded from electronic-cable.

    for rb25 electronic-cable you need to buy this assembly (part number 3270202G17)
    then pull off the rb25 gear off the electric assembly and use a 10mm drill bit to drill the center.
    then slide it on the new assembly (after removing the old one of course) and use some glue to secure it.





    1. starting with oil pan you can either mod your aluminum awd pan to be without the huge front differential case or just pull the axles and diff out and leave it as is.
    or you can buy an rb oil pan. rb25 or 20 and modify it to work.

    the differential does not share your engine oil so drain that nasty smelly gear oil out of there.

    2. for the transmission its fairly simple. use an rb20 rwd trans or if you want it handle alot of power go rb25. you need the rubber mount for whichever trans you choose.

    for the rb20 transmission your gonna need the rb20 slave cylinder. for rb25 transmission the awd slave cylinder works perfect.

    3. now with driveshaft the awd one is useless. try and sell it or take it for steel scrap.
    you need the gts-t driveshaft. (rb20 rwd) and it has to be a complete driveshaft.

    the gtr and gts-4 have the gts-t's same mount to bolt up the gts-t's driveshaft. the steady bearing mount used for the gts-4/gtr driveshaft is no longer used. (the one you need it farther down the trans tunnel)

    (this info is for rb25 trans only) when using a rb25 trans you will need to use a z32 TT yoke.
    simply buy a z32 front driveshaft piece and cut the yoke off and weld it where the rb20 one was on the gts-t driveshaft.

    the longer driveshaft is the gts-t one. the other is the z32tt one needed for rb25 trans


    4. the pinion yoke. if you dont know what this is it bolts to the pinion gear on the front of the differential. it also gets bolted to the back of the drivshaft.

    this HAS to be changed. i know for sure that z32 pinion yoke is perfect. i would assume gts-t one would too. maybe even s13. this has yet to be proven. to remove it you simply have to remove the decent size nut in the middle of it and use a pulley puller to remove it. ( i haz. you may borrow yes)

    after its out gear oil will go everywhere! it is recommended to have a catch basin below to avoid that awesome gear oil everywhere.

    put the new yoke on and start tightening it. this is very tricky to get right! lock your ebrake and turn it UNTIL it stops wobbling up and down. keep shaking it every little pull and try to hear/feel it clunking up and down. once you can not feel it doing that make sure you can turn the wheels easy with it after. if it has huge resistance you overtightened it. do NOT over tighten it or your pinion bearings will be ruined.

    make sure to add gear oil to your diff now that you lost a little bit of it. pictures below

    finished product



    5. the crossmember is fairly straight forward. you use the awd one with the mounts unbolted from the middle.

    next step is to weld 2 peices of 1.5" steel square tubing on it. like pictured below.

    next drill 2 holes on the top tube to match your rubber trans mount. also pictured


    6. front axle removal/mod. now this is a key step to save your front wheel bearings.

    your gonna have to butcher your awd axles whether you want to or not. or trade a buddy that has busted ones and he can have your good ones if they are good.

    they start out looking like this once removed


    you have to tear the outer boot off. and i used a zip disk and kept cutting the bearing holder out untill i got them to look like this after (seen standing up) very messy work.


    you have to bolt these on to keep your bearings intact. make sure you saved your hardware to bolt them on. should fit exactly the same. washer-nut-rubber bushing-lock washer-pin. they are 3/16 cotter pins if you broke yours getting them off.

    what they look like installed.


    7. now the attessa lines are gonna be in your way. there is one under the driveshaft that needs to go. it went into the back of the awd trans to activate the awd system. just snap the bugger off wiggle it back and forth and itll break. (it should have drained when you removed the trans) or do it properly and remove EVERY attessa line.

    if i remember right that line is bolted to where you gotta bolt the driveshaft steady bearing. that mount for this line has to go. you need the steady bearing to be bolted all the way up.

    either to remove the attessa pump and reservoir is up to you. in order to remove it the subframe has to come out. simplest way is to reach up (its above the diff like pictured below) and just unplug the electrical lines so it doesnt pump dry and be the most irritating sound ever.

    pictured on top. the 2 round looking things are it.


    and what it looks like removed.







    if you are going with an entire different rb motor. ex: gts-t rb20 into gts-4. or rb20 into gtr.
    you will need rb26 motor mounts and the aluminum brackets. they look like this




    if you have any questions please ask away. i did this walkthrough for a friend but i have had others pm me and ask how to do this aswell.
    Last edited by RWD_GTR; 05-05-2012, 04:30 PM.
    RB25 Powered RWD GT-R

    Owner for Turtle Garage Hicas Delete Systems

  • #2
    this is awesome! id lke to do this once i get a place....good job!
    Toy: BNR32
    DD: R50

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    • #3
      Sent from my iPhone using Tapatalk
      1989 R32 Skyline GTR SOLD!!!!

      The key to immortality is first living a life worth remembering.
      -Bruce Lee

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      • #4
        Originally posted by feyd182 View Post
        Sent from my iPhone using Tapatalk
        ^ is that so? lololol


        Original post edited with fixes to some errors and extra missing info.
        Last edited by RWD_GTR; 04-02-2012, 06:26 PM.
        RB25 Powered RWD GT-R

        Owner for Turtle Garage Hicas Delete Systems

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        • #5
          Sorry, brainfart.


          Sent from my iPhone using Tapatalk
          1989 R32 Skyline GTR SOLD!!!!

          The key to immortality is first living a life worth remembering.
          -Bruce Lee

          Comment


          • #6
            Or the easy way: just pull the fuse.

            Or the slightly less lazy way, gut the tcase and use the trans you already have (or don't gut the tcase, it's not that much extra weight)

            300ZX front hubs/etc fit skylines and take care of the wheel bearing issues.
            1992 GTR - 2.7L, GT2871R's, forged bottom end, big valves, 270* cams, R34 getrag
            2000 Honda Insight - 70+mpg daily driver
            2003 Sierra 2500HD Diesel - Tow vehicle

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            • #7
              make your own thread if you think your way of doing it is proper. mods please delete his post.
              RB25 Powered RWD GT-R

              Owner for Turtle Garage Hicas Delete Systems

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              • #8
                Anyone have an idea of how much weight this saves?

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                • #9
                  i would say at least 100 lbs
                  RB25 Powered RWD GT-R

                  Owner for Turtle Garage Hicas Delete Systems

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                  • #10
                    Originally posted by RWD_GTR View Post
                    make your own thread if you think your way of doing it is proper. mods please delete his post.
                    Didn't mean to offend you. Don't take everything personally. It's the internet. If you want to turn your GTR into a GTS nobody will stop you.
                    1992 GTR - 2.7L, GT2871R's, forged bottom end, big valves, 270* cams, R34 getrag
                    2000 Honda Insight - 70+mpg daily driver
                    2003 Sierra 2500HD Diesel - Tow vehicle

                    Comment


                    • #11
                      Originally posted by RWD_GTR View Post
                      make your own thread if you think your way of doing it is proper. mods please delete his post.
                      Your post is a DIY / How To... and should be open to other contributions?. Great detail/info, why the conversion - drift car?

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                      • #12
                        i did start building it for drifting but i dont wanna compete in my car. its gonna look to nice.

                        i had all this info from doing it myself and thought i would share my knowledge with the skyline community.


                        Originally posted by Terrh View Post
                        Didn't mean to offend you. Don't take everything personally. It's the internet. If you want to turn your GTR into a GTS nobody will stop you.
                        you have your ways and i have mine. im trying to show the way of doing it permanently while reducing alot of weight.
                        Last edited by RWD_GTR; 04-03-2012, 12:50 AM.
                        RB25 Powered RWD GT-R

                        Owner for Turtle Garage Hicas Delete Systems

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