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Old 08-08-2006, 10:41 AM
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Rear Suspension Chatter driving me nuts

My 37 Plymouth is set up with the original 1.75" wide parallel leaf springs. The rear axel is an early 70's Nova 10 bolt with drum brakes. The springs have been fitted with new rubber bushings, new custom shackles and new bolts all around. I have a chatter/rattle noise that I cannot isolate. It is driving me nuts. I have new gas shocks of the proper length that are well clear of the axel and frame. The parking brake mechanisms have been removed (temporarily) while I try to isolate the noise. I have rebuilt the brakes and all parts are fresh and fit correctly without any sloppy or loose fitting parts. None of the moving suspension components make contact with stationary parts throughout the spring travel range. What am I missing? The thru bolts passing thru the spring perches fit nicely (but not tightly) into the steel sleeve inside the rubber bushing. The fit seemed right when the parts came together. Could 0.0312" of play be enough to cause a loud rattle sound? I'm really stumped.

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Old 08-08-2006, 12:26 PM
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Could it be the spring clamps ?
I know some Chevrolets had a small clamp on the spring pack ... maybe your 37 Plymouth does also ??

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Old 08-08-2006, 12:40 PM
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Have you checked the brake lines all the way from the master cylinder to the brakes. If the clips and clamps are not tight they may rattle. Was something in left the frame at one time and has just come lose? I had both of these problems in the past.
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Old 08-14-2006, 11:32 AM
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The springs are clamped. I have inspected them and they appear to be tight. I have banged on them with my rubber hallot and they don't make any rattle noise.

The hydraulic line that attaches to the axle may be the source of the noise. I'll add some rubber hose wraps at a few points to see if that makes a difference. The rest of the tubing is already mounted in rubber clamps, but I will go over all of it just in case.
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Old 08-14-2006, 07:23 PM
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How does the exhaust system route?
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Old 08-15-2006, 08:35 AM
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I have had the rivets on the shock mounts come lose so the mount would rattle when driving took me months to find it.I had a shock start to leak and noticed the bracket was lose while I was changing the shock.
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Old 08-23-2006, 10:46 AM
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The problem is solved. The rattle came from a loose upper shock mount. The mount is a thru-bolt stud that passes thru the frame rail and had worked loose just enough to make a real racket while driving. I found it by systematically removing or disassembling parts of the suspension until the problem was discovered. It is really nice to have that embarrasing rattle gone! There is another one for the story book.
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