biohazard53188 Posted March 23, 2007 Share Posted March 23, 2007 So my friend is looking to buy a 77 280z from his boss but the only noticable thing that we find wrong with it (for the price) is when we give it full throttle while driving there is a large clunk sound in the rear. It accelarates fine but this seems like a problem. What could this be? Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted March 23, 2007 Share Posted March 23, 2007 Broken front diff mount. Very common. Could also be bad bushings and or loose diff bolts. But chances are it is the diff mount. Quote Link to comment Share on other sites More sharing options...
MrFancypants Posted March 23, 2007 Share Posted March 23, 2007 ^^ What he said. Search on "diff mount". My 260Z did exactly what youre describing and the front diff mount was completely failed in two pieces. You can get a brand new stock one for about $50 and it's relatively easy to install. Then there are ways of reinforcing the mount (Search on Ron Tyler) to prevent the new one from tearing. - Greg - Quote Link to comment Share on other sites More sharing options...
biohazard53188 Posted March 24, 2007 Author Share Posted March 24, 2007 Awesome, thanks guys. Ill look into that. So I guess the sound is the differential pounding on the car? Quote Link to comment Share on other sites More sharing options...
Daeron Posted March 25, 2007 Share Posted March 25, 2007 it MIGHT also be a bad U joint in the driveshaft or halfshaft, but diff mount is the most likely culprit. Quote Link to comment Share on other sites More sharing options...
Nismo280zEd Posted March 27, 2007 Share Posted March 27, 2007 Most classic Z problem ever. Quote Link to comment Share on other sites More sharing options...
ARZ_ Posted April 18, 2007 Share Posted April 18, 2007 Awesome, thanks guys. Ill look into that. So I guess the sound is the differential pounding on the car? Take a leather belt (like one you wear) fold it in half like your going to make that snapping sound. Hold the belt in your hands (while standing) biceps vertical, fore arms horizontal. Bring you knee up quick, stop it with your belt. Now imagine your hands are fastened to the tunnel with no rubber mount. And your knee is the front of the diff. Thats exactly whats happening. No real damage done in the short term. In the long term you could destroy your moustache bar bushings or possably break the moustache bar itself, but that would take a long time. Definately not worth over looking a good Z for. Hope that explains it. Quote Link to comment Share on other sites More sharing options...
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