FlameThrower Posted May 13, 2010 Share #1 Posted May 13, 2010 Ok so i had my car up on the lift today to do a general assessment of things that are going to need attention soon and i came across a few interesting things. Im sure this cant be a Datsun thing can it??? It looks like it has hit the diff a few times. Any idea what this does/what it is for?? Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/ Share on other sites More sharing options...
Zs-ondabrain Posted May 13, 2010 Share #2 Posted May 13, 2010 Nissan used to throw those things on to counter ballance harmonic vibrations. or some crap like that. Though that one looks a little onthe tall side, compared to the others I've seen.Dave Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319467 Share on other sites More sharing options...
Zforce Posted May 13, 2010 Share #3 Posted May 13, 2010 Dealer installed anti vibration damper thingy supposed to cut noise and vibration for those who complained. Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319468 Share on other sites More sharing options...
grantf Posted May 13, 2010 Share #4 Posted May 13, 2010 Wow! I have those seemingly useless blocks bolted on my car also but I have nver seen them welded together or 4 plus stacked and welded, makes me think someone was trying to eliminate a common problem the wrong way. but what do I know? Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319483 Share on other sites More sharing options...
Zed Head Posted May 13, 2010 Share #5 Posted May 13, 2010 Wow! I have those seemingly useless blocks bolted on my car also but I have nver seen them welded together or 4 plus stacked and welded, makes me think someone was trying to eliminate a common problem the wrong way. but what do I know? I have a 76 and a 78 parts car and they both have that ugly-looking thing. Zs apparently came from the factory like that, not sure what year it started. It's in the Rear Axle and Suspension section of the FSM, called a "damper plate". It must be designed to damp either vibrations or clunks, I would guess. By the way grantf, I went to see what year car you had and your About Me says that you don't even have a car yet. Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319487 Share on other sites More sharing options...
FlameThrower Posted May 13, 2010 Author Share #6 Posted May 13, 2010 That's why i was curious about what exactly it was because it looks like a hack job fix.As for damping vibrations/clunks it is not doing its job because when i let off he gas then put my foot back in it there is a nasty clunk when the power comes back on, this could be a bad transmission mount though. All of the rubber bushings seemed to be in rough shape when i inspected it Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319493 Share on other sites More sharing options...
grantf Posted May 13, 2010 Share #7 Posted May 13, 2010 (edited) I have a 76 and a 78 parts car and they both have that ugly-looking thing. Zs apparently came from the factory like that, not sure what year it started. It's in the Rear Axle and Suspension section of the FSM, called a "damper plate". It must be designed to damp either vibrations or clunks, I would guess.By the way grantf, I went to see what year car you had and your About Me says that you don't even have a car yet. I have a 78 280z, look up my older posts there are pictures of it. I will updat my profile. here again is a pic of my "damper plate" Edited May 13, 2010 by grantf Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319503 Share on other sites More sharing options...
grantf Posted May 13, 2010 Share #8 Posted May 13, 2010 That's why i was curious about what exactly it was because it looks like a hack job fix.As for damping vibrations/clunks it is not doing its job because when i let off he gas then put my foot back in it there is a nasty clunk when the power comes back on, this could be a bad transmission mount though. All of the rubber bushings seemed to be in rough shape when i inspected itseems you have the same "clunk problem I do" search for "clunk" you will find much info as I have. Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319504 Share on other sites More sharing options...
texasz Posted May 13, 2010 Share #9 Posted May 13, 2010 I've seen these before though never on the car, always in a pile of parts...in fact I believe I just sent one to the recycler last month.Clunks could be U-Joints or mounts or even the diff arrester strap. Check them all. Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319522 Share on other sites More sharing options...
esprist Posted May 13, 2010 Share #10 Posted May 13, 2010 I've seen these before though never on the car, always in a pile of parts...in fact I believe I just sent one to the recycler last month.Clunks could be U-Joints or mounts or even the diff arrester strap. Check them all.We created this so that the arrester band funtions as dumper to reduce that crunk during on-off accelarations.http://jdm-car-parts.com/customizing/goto-band-arrived-datsun-240z-260z-280z/ Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319588 Share on other sites More sharing options...
grantf Posted May 13, 2010 Share #11 Posted May 13, 2010 We created this so that the arrester band funtions as dumper to reduce that crunk during on-off accelarations.http://jdm-car-parts.com/customizing/goto-band-arrived-datsun-240z-260z-280z/interesting, where does it attach? Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319592 Share on other sites More sharing options...
sblake01 Posted May 14, 2010 Share #12 Posted May 14, 2010 We talked about that a coupe years ago. It's a NVH damper (Noise-vibration-harshness). Here's the TSB:TSB # TS75-068A, Sept 3, 1975“Countermeasures for S30 R180 Differential Noise”To reduce internal noise in the S30 differential a differential noise damper kit is now available as a service part. Differential noise is caused by the tooth meshing action of the ring and pinion gears, amplified by structural vibration of the vehicle body. The noise damper kit contains a 10 lb mass damper weight which attaches to the differential housing to absorb structural vibration and the necessary attachment hardware. The kit can be also be applied on the 1970-74 S30, R180 differentials only. This kit should not be used on any 2+2 vehicle due to possible interference with the rear seat belt attachment bolts.Kit Part Number: 99991-20000 Link to comment https://www.classiczcars.com/topic/35878-odd-part-near-rear-diff/#findComment-319613 Share on other sites More sharing options...
Wilbur
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