Re: IML: Raising the Rear

["JIM LORENZEN" <jdlpdx@xxxxxxxxxxx>]

I concur with Paul.  I got my '60 when it was 10 years old with 57,000+ 
miles on it.  I noticed the inverse arch of the rear springs and even took 
it to the dealer thinking something was seriously wrong.  The head service 
writer at the dealer assured me that it was just fine and that a "normal" 
arch would cause the problems Paul has outlined.
If anyone knows the 1960 it is Paul as his has been in his family since it 
was new.

Jim L. in OR
   '60 Crown 4dr hdtp
   '62 Crown 4dr hdtp


----- Original Message ----- 
From: <randalpark@xxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Thursday, May 17, 2007 4:14 PM
Subject: Re: IML: Raising the Rear


1960 Imperial rear leaf springs are designed to have an inverted arch
or slightly "upside down" appearance. If they are arched with the ends
upward as one would expect, they are not correct. Several years of our
cars were made this way. An improper arch will change the drive shaft
angle.

If the drive shaft is hitting the floor, it is because the carrier
bearing insulator is broken. This would feel very different than a
simple vibration. I have had this condition, and there isn't any
mistaking the pounding of the drive shaft on the floor of the car. It
is very loud.

If you truly have the vibration associated with improper drive shaft
angle, it will occur during acceleration at around 30 mph and go away
around 40. It only will vibrate under load. It may diminish or go away
with passengers in the back seat.  Broken or missing rear axle support
struts will cause a similar sensation, since the axle housing would
shift, thus changing the angle under load.

Paul W.

-----Original Message-----
From: shelbyguy@xxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Thu, 17 May 2007 12:42 PM
Subject: Re: IML: Raising the Rear

Paul,
I have the original springs on my 60 and I have that'very annoying
vibration' during accleration. The transmission guy told me he thought
the the drive shift was hitting the floor because of sagging springs.
The springs are just about flat. In you experience, does this sound
like the proper diagnosis? I was actually turning into the parking lot
of the spring place last October when the power steering hose ruptured
so springs moved down a bit on the priority list.
Thanx
Tom
60 Crown
----- Original Message ----- From: <randalpark@xxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Thursday, May 17, 2007 3:56 PM
Subject: Re: IML: Raising the Rear

Raising a 1956 through 1966 Imperial rear to above stock hieght changes
the second drive shaft angle. On '56 through at least '62, and possibly
the others as well, this usually creates a very annoying vibration
during acceleration. Some of this can be alleviated by removing the
stack of shims undereneath the carrier bearing housing. Doing that
makes the angle incorrect when there are passengers in the back seat. I
question the need to raise the car. It was designed to be a particuar
hieght for both appearance and handling reasons.

Paul W.

-----Original Message----- 
From: tumanycars@xxxxxxxxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Thu, 17 May 2007 10:54 AM
Subject: Re: IML: Several problems

Rear leaf springs can be obtained from Eaton (www.eatonsprings.com).
Last fall I priced a set of springs for a 63 Imperial. The price was
around $459.00. I have not yet purchased them but have bought springs
from Eaton for other cars. They make the springs to your
specifications. I have had springs made to raise the vehicle above
stock height.

Ray
2-63 convertibles

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