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Identify what this is from


McDoogle

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They're both for an S30....just different styles.  The top half-shaft bolts to the differential stub axle with 4 bolts (similar to how it bolts to the hub flange at the outer); and the bottom unit uses a single "button-style" bolt to bolt onto the differential.  They both should extend and compress to the same lengths as each other.  I don't remember if they were year-specific, but they can be interchangeable if necessary.  Datsun switched to CV axles in the rear end during production of the S130.  Hope this helps -- I'm sure others will chime in with additional info regarding year-specific details.

 

Did they both come from the same car?  If so, a PO must have swapped one out for a different style at some point.

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Looks to be the same.  I had that style half-shaft on the first R180 that came on my late '74 260Z, but I have no idea if it was the original R180 that came with the car from the factory.  I switched half-shafts to the other style only because they're easier for me to remove during maintenance on the rear end...purely personal preference.  Maybe it was only the turbo ZXs that came with CV axles and R200?

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In my experience, R180s have always had the style axles on the bottom and R200s have always had the style axles on top. Sounds like they may interchange but I've never personally tried to do so.

 

I'm pretty sure that all turbo ZXs and later 2+2 ZXs had CV axles (maybe all 2+2, not 100% sure on that one).

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Well they appear to be the same size so im going to just swap the two ends and call it a day.  The car is an early 260z but has an l28(n42) in it.  Im assuming the whole driveline has been swapped from another car.  How can i tell what differential i have?

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R180: 5-bolt aluminum seal retainers on the sides of the housing, rectangular rear cover that is noticeably taller than it is wide

 

R200: seals seated directly into housing, cover is much more square shaped

 

Search "R180 differential" on Google images and one of the first few images will show the difference in the rear cover

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