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I noticed today that MSA has begin to offer refurbished differential hanger brackets on an exchange basis. In their write-up on these new parts, they discuss applications in relation to solving the differential 'clunk' problem and emphasize that Series 1 owners will need to install the Series 2 differential hanger parts and moustache bar in order to be able to use the Series 2 front insulator (I believe that this is because the arrestor strap won't fit otherwise). This made me curious, so I started to look around some of the commonly-used parts vendors' websites to see if anyone was offering the Nissan Series 1 part (PN 55415-E4102, for reference). A quick look turned up 'not available' at Rock Auto and Chesapeake Nissan. Z-Car Source of Arizona offers only used units, and only on special order. Courtesy Nissan lists the part and a price, but that doesn't mean they have it or can get it (I haven't asked them yet). MSA lists it, but warns that it "...has been discontinued by Nissan or another manufacturer, and we are currently in the process of locating an alternate supplier or having the item reproduced" So: Is a new OE Series 1 diff mount/insulator definitely NLA ? If so, are there any known aftermarket options?
I couldnt find anything that described what I have just the usual clunk at changing gears typical of a bad mount. I have an early 1971 Datsun 240z with a 4 speed manual built in 1/71. All original to my knowledge. Besides the clunk at accel and decel (front diff mount that is no longer in production) I also have a loud clunking/rattle when i let go of the gas over 60mph then goes away under 60mph. Sounds like somebody with 2 hammers hitting the bottom of the car rapidly. When I have it up on jack stands it does the same on 2nd and 4th gear at idle. its louder on the drivers side wheel for some reason.. Quieter without the wheels. when i hold the drivers side wheel and let the passenger side spin away (yes its an open diff) it still makes the same loud clank on the drivers same if i hold the passenger side wheel. still louder on the drivers side.. and also jerks at the wheel when holding it.. Bad Diff?
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