Re: IML: Raising the Rear

[randalpark@xxxxxxx]

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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