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So I have recently bought a 1990 r32 skyline gts-4. Unfortunately, the person I bought the car from must have never put any diff oil in it, and i drove it for 3 hours home and the diff blew up. Im trying to find a diff to replace it with, but due to the rarity of the gts-4, im struggling to find one.
I was wondering if any one could tell me what cars have the 4.3:1 ratio that i need and would also bolt straight on to the 6x1 bolt pattern since the other varients of the r32 would not work. Thanks

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GTS4 does not have 6x1 diff flanges.  That's the GTR diff.  GTS4 has the same 5 bolt flanges as the GTSt.  And the ratio is not 4.3.  It is 4.375.  This is important, because the normal GTSt diff is 4.3 and they are not the same ratio.

Most of these diffs have been gobbled up by GTR owners wanting shorter gears for their cars.

What died on your diff?  You can (and should) get aftermarket centres that are 5000000000000 times better than the shitty viscous centre in there.  And you can buy CW&pinion sets.  And you can buy bearings.  So unless the housing it rooted, you can rebuild it.

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The R32 GTS-4 is a 6x1 diff flange. The complete rear subframe in the R32 GTS-4 is the same as a R32 GTR including the alloy hubs, the only difference is the VSD diff centre instead of LSD diff centre. The price they ask for the GTS-4 gears it would be cheaper to change to GTR 4.11 front and rear diffs. 

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Would i encounter any problems if i only replace the rear diff with the gtr rear diff that has a different ratio?

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Yes, you'll need to change both front and rear diffs or the front wheels will spin faster/slower than the rears (depending on what you change the rear diff gears to)

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