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Thread: GTS4 RB25DET swap /w RB20 transmission.

  1. #1
    GTRCer TBird713's Avatar
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    Jul 2011
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    GTS4 RB25DET swap /w RB20 transmission.

    As title says, that is looking like the most likely scenario for my car. The one thing that I CAN NOT figure out is what I am going to do about the front diff. It's running a full 4WD rb20det setup, but the only rb25's you can really get these days is rwd only.

    What do I do about the front diff/oil pan?

    If nobody can figure out how to get around that, what do I do about the cv shafts that are there? I've heard you need a shaft by some mechanics I know, but maybe they're wrong?

    I would really love some good input on this as it's a major decision on whether or not I keep the car =/. Otherwise I may have to go through the hassle of dropping in a single turbo rb26, which is muuuuch more money and might not be worth it!
    91 Skyline GTS-4 RB20DET

  2. #2
    GTRCer gtrjon's Avatar
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    Sep 2010
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    im no expert on rb20 or 25s for that matter but im pretty sure you can mod a rb25 oil pan to make it work...
    1991 Nissan Skyline R32 GT-R:512awhp @ 18psi on rgs dyno

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