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Noisy front end blues.


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The front of my 71 Mach was pretty noisy, so I rebuilt everything on the front suspension...EXCEPT the springs. They looked to be in good shape, so I just replaced the insulators and the perches with a pair from Scott Drake. It's better. no rattle, but still gives me the "boing!". Will bad springs be noisy like that? Or will they just sag. I know that the simple answer is "just change the springs stupid" but I also notice that the passenger spring seems to be rubbing against the outside of the tower it sits in. I thought that it was being caused by a worn out control arm, but now I'm not sure. Does that mean something is seriously wrong with the subframe? Thanks!

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On the outside there is a shock tower cover (looks like this: https://ohiomustang.com/store/order_page.asp?itemid=1107). It could be that the cover is warped/bent or maybe it has something stuck on it. As the post above, pictures would help of not only the rub, but also the cover.

20160929_171923_edit2_small.jpg

 

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump

Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes

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Look in this general area pointed by the yellow arrow:

1512621259_20210101_175244-arrow.thumb.jpg.c20a3702c377eab84412af01dc9e7f0d.jpg

20160929_171923_edit2_small.jpg

 

1971 M-Code Mach 1 w/Ram Air, 408 stroker, 285/291 0.558" roller cam, Blue Thunder intake, TKO600, Hooker headers with electric cut-offs, FiTech EFI w/ RobBMC PowerSurge pump

Strange center section with Truetrac, 3.5 gear and 31 spline axles, 4-wheel disc brakes

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The spring should not contact the car anywhere.

Is the spring sitting in the lower seat correctly, as the tangent tip up against the stop on the lower perch?

Most of the time coil springs will just sag, but a natural consequence of this loss of free height is more coil-coil contact which can be heard if its bad enough.

If the 'boing!' noise you are hearing is something you can feel as well my guess would be that the spring is mis-located on the upper or lower seat somehow, and is rubbing on the body or a fastener inside the tower. I have seen times were a bolt is run into the tower and is too long and touches the spring...

Matt

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