So I got the car going again and taking it for a nice drive I noticed that around 110km/h it starts to vibrate as if the rear end is going to fall off.
It's definitely coming from the rear of the car and not the front.
I started to think it may be due to the angle of the engine/gearbox, the tailshaft and the differential.
I have read the link:
http://www.ozdat.com/forum/viewtopic.php?f=8&t=25262
Which states the diff angle should be as close as parallel to the gearbox angle.
So I decided to measure the angles and I got the following:
-0.5deg for the Diff
+2 for the tailshaft
+3.5deg for the Engine/gearbox.
Angles were measured using an 'Empire Angle Meter Level/Protractor' and mounting on the flange of the diff (tailshaft removed), the tube of the tailshaft and the output shaft of the gearbox. Angles were also corrected (as I jacked up the rear end) according to the angle I had jacked up and subtracted accordingly.
So this isn't the case as the recommendation!
NOTE: I am running the Datsport front end, Datsport gearbox cross member, Datsport rear moustache diff bar. I have put the whiteline diff bushes with the thick part on top and the thin on the bottom. Previously I had the thin on top, but this would increase the angle (raise the rear of the diff up pointing the front of the diff lower into the ground, which I would assume would make the whole thing worse.
See attached image which describes it graphically.
So what I am trying to find out is: Who is running a similar setup and has the moustache bar bushes swapped (small at the top, thick at the bottom - opposite to what I have)?
Has anyone else had vibration issues?
As a few quick checks, I am thinking of swapping the moustache bar bushes and also checking the tailshaft is balanced properly.
Does anyone else have any recommendations?
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1972 Datsun 1600, S14 SR20DET Engineered (204rwkW @ 17psi.)
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