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Discussion Starter #1
Did a 1970 240Z come standard witha rear stabalizer bar. I have different stab bushing than I should which raises questions. My front bushings are half round like my rears. Should not the rears be square ?
Also my car makes a funny clunk only when I start from a complete stop. Kind of like something bonds when i stop and then releases when I go. I only get in first /second gear otherwise solid shifts w/ no play. It seems the way Datsun used the same control arm for both sides that one is just inverted that one stabalizer bar endlink should be slightly longer than the other side?? Anybody else catch this or am I flippin out????

Rik
 

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The rear sway bar was an option in 73 (maybe 72) but not in 70. Now for the easy stuff first..the control arms are machine stamped and inverted (as you thought). I believe they were the same as those for datsun's large Salon car. Now to the harder part, the noise (aka. the "clunk"). Early 240s (pre72) have straight bars located just behind the diff unit and some have no "rubberband" diff strap. datsun improved the diff support unit by adding the rubberband and curving the mustache bar bottom section to allow for more rearward travel of the diff during takeoff. As to the noise or clunk, almost every owner of a 240 has heard it, tried to fix it and at some point learns to live with it. First you must determine if the noise is of any real concern (eg., is it real) check all your u-joints, the driveshaft, the diff mounting insulator (replace if you can't remember when it was last installed) conditions in which it makes a noise (could it be the diff gears). You can replace the straight section of the mustache bar holder and while you're at it upgrade your diff too if a non-stock car is okay with your plans for the car. I've had three different diffs in my car in the last 3 years and they all had a clunk. They usually did so right before a long trip, an autocross event or whenever I was several hundred miles from home (at night). Good luck....
 

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mmmmmm the Z clunk.. i miss mine.. not because i fixed it but my cars at the autobody shop.. i blew the motor mounts in my VW GTI just to try and pretend it was the same thing but its not :( a 1.8 hitting the hood just doesnt sound the same as a diff clunking up under your ass.. but you can buy a solid diff mount from motorsport ..or other sources.. and you can rig up some kind of strap or metal band to hold the diff down.. its probably a worn mount and the diff pulling up when the driveshaft starts its spinnin
 

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Cheap fix for diff clunk

For the last few years I've had no diff clunk whatsoever. My solution? Loosen the front diff mounts and stuff an appropriately folded shop rag between the diff snout and the strap that is supposed to limit vertical motion, but never does for long. Retorque the mounts and voila! No more diff clunk. Sure, it's a hokey repair, but then so is the original Nissan design. And unless you show the car, who cares if you suppliment the OEM strap with a bit of padding?
 
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