Need Replacement Front Spring B4U to Match Original Rear Spring in Level Ride - Chevy Impala SS Forum
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post #1 of 24 (permalink) Old 10-04-2019, 01:25 PM Thread Starter
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Need Replacement Front Spring B4U to Match Original Rear Spring in Level Ride

I haven’t logged onto the Impalassforum in a long time, but I still look when I need information. My name is Black Caprice. I am writing for a suggestion on a set of front springs for my Caprice.

The car is a 1995 Caprice with a 5.7 model B4U. The codes are FE3, and the spring codes are 6TS and 7TN. The passenger side height to the center of the wheel trim is 29”. The car has 159,000 miles, the chassis is rusty but not broken anywhere. The driver side front spring has broken. I would like to replace just the front springs & shocks, to keep cost low. The car is a daily driver in upstate New York with road salt and ruff paved roads. With replacing the front spring with a basic stock replacement, I fear would result in the front sit higher than the rear. I first thought get a set of new stock SS springs, but I see they are not made.

In asking for input on a suggested spring, I am asking for a lower spring (approximately 1” lower), trying for height to end match aged rear stock springs. I am not looking for any huge change in stiffness (higher or lower). The car has stock size 235/70/15 tires on 8” rally wheels. I realize what is provided for a suggestion may not be perfect (I don’t know what perfect what be) in height but I believe it will not end up significantly higher in the front than the rear. I plan to use the Monroe Severe Service Shocks.

I am also asking for alignment spec. recommendation. The forum used to have 3 different recommendations and last I looked for that it was lost.

Thank you in advance for your suggestions. I believe I have attached enough information.

Alan
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post #2 of 24 (permalink) Old 10-04-2019, 02:14 PM
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I tried your way on a 76 Cutlass and the results were not good. The front was new and firm and the back was soft and bouncy, I know it is not my money but I would recommend new coils and shocks all around. At a minimum do the shocks so the front and back have a similar damping rate. Your tires are (I think) the maximum stock size and that should be considered when lowering a car.


Sorry I do not know who on the forum wrote this:

Specification (deg) Tolerance (deg)
Front Left Camber -0.25 0.25
Front Right Camber -0.25 0.25
Front Cross Camber N/A 0.25
Front Caster 4.00 0.50
Front Cross Caster N/A 0.50
Front Total Toe 0.00 0.06
Rear Camber 0.00 0.50
Rear Total Toe 0.00 0.12
Thrust Angle 0.00 0.25
Don't let your dealer con you into charging you extra for setting these specifications up. If he can't/won't do it, then go somewhere else. You'll immediately notice a difference in handling, response and tracking once you get the alignment dialed in correctly. Also, note that all of the above specifications are well within factory tolerance, so there shouldn't be any issue with warranty or liability.

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post #3 of 24 (permalink) Old 10-04-2019, 10:12 PM
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https://www.impalassforum.com/vBulle...ent-snafu.html


Tire & Wheel Alignment Specifications For The 94-96 B-Body



GM Factory Service Manual Alignment Specifications For 15x7 Wheels & OEM 70 Series Tires.
Here's some improved, more precise alignment specifications for 17" wheels/tires and others larger than stock 15" wheels/70 series tire size.


FRONT

Caster


Left.............................................3.25° +/- 1.0°


Right...........................................3.75° +/- 1.0°


Cross Caster.....................................0.50° +/- 0.7°


Camber.............................................0.0° +/- 1.0°


Cross Camber....................................0.0° +/- 1.5°


Individual Toe.................................0.08° +/- 0.1°


Total Toe.........................................0.16° +/- 0.2°


Steering Wheel Angle.......................0.0° +/- 2.5°


REAR


Thrust Angle..................................0.00° +/- 0.15°

FRONT

Caster


Left...........................................4.00° +/- 0.50°


Right.........................................4.00° +/- 0.50°


Cross Caster...................................N/A° +/- 0.50°


Camber...........................................0.25 +/- 0.25°


Cross Camber.................................N/A° +/- 0.25°


Individual Toe...............................0.00° +/- 0.00°


Total Toe.......................................0.00° +/- 0.06°


REAR


Camber.........................................0.00° +/- 0.50°


Total Toe.......................................0.00° +/- 0.12°


Thrust Angle..................................0.00° +/- 0.25°


Not for use with 60 series tires.
Don't let your dealer con you into charging you extra for setting these specifications up. If he can't/won't do it, then go somewhere else. You'll immediately notice a difference in handling, response and tracking once you get the alignment dialed in correctly. Also, note that all of the above specifications are well within factory tolerance, so there shouldn't be any issue with warranty or liability.

Z09B4U
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post #4 of 24 (permalink) Old 10-05-2019, 06:25 AM
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You can get coils of known pedigree at a JY, and ain't none cheaper than there if cost is key. Off an Impala SS would be a coup, but I should think 25-year old sacked out Caprice suitable - if cost is key.


For new, have you checked the coil stickie and suspension stickie - and all the other related threads?

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post #5 of 24 (permalink) Old 10-05-2019, 10:53 AM Thread Starter
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I have read numerous threads, the stickies at the top. As I am unaware of the specs of my stock springs it is hard to go from.

Looking up my spring codes of 6TS & 7TN in the one factory sheet it is mid firm for sedan and firmest for wagon. Now looking at Moog stock replacement the 8000 is the replacement for the wagon. So using the 8000 specs and the Excel sheet ( I apologize I don't recall who created), and using his weight of 2290 or the weight shown for the 8000 spring of 2555. The springs that are slightly lighter in spring rate are 586 which would drop .41" and the 8002 which would drop .61".

So the 586 and the 8002 I am intrigued with. Does anyone have the stock specs for the FE3 suspension or the 6TS & 7TN springs? That is the only thing I can think might help in finding slightly lower springs. Remember ideally I am only looking for the car to sit fairly level with the aged rear springs.
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post #6 of 24 (permalink) Old 10-05-2019, 09:23 PM
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Not sure which rev of spreadsheet I left at here, but I at work I'm up to Rev D1 or later. Both the 586 and 8002 would be lower that stock SS springs, according to the math. Where as the 584 would be 1/2" higher than an SS at the wheel well.


Also, unless you're looking to save the originals, nothing wrong with cutting them. Then you're just about guaranteed to get the drop you want.


If the .2" difference between each spring in the GM chart holds true through out the range, we can probably figure out what your springs started out as.
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post #7 of 24 (permalink) Old 10-06-2019, 09:43 AM Thread Starter
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Quote:
Originally Posted by 91ss View Post
Not sure which rev of spreadsheet I left at here, but I at work I'm up to Rev D1 or later. Both the 586 and 8002 would be lower that stock SS springs, according to the math. Where as the 584 would be 1/2" higher than an SS at the wheel well.


Also, unless you're looking to save the originals, nothing wrong with cutting them. Then you're just about guaranteed to get the drop you want.


If the .2" difference between each spring in the GM chart holds true through out the range, we can probably figure out what your springs started out as.
The reason I am replacing the front springs is one is broken in 2 places, so saving or using them I don't think is a reasonable option.

The springs on the trunk label are 6TS and 7TN, if you or anyone can get the specs on the original springs would be greatly appreciated.

I am looking for a lower spring for the front, as the original rear I believe have settled some (what amount I have no idea). My goal is to not have the replacement front springs have the car sit higher in the front than rear and to have similar (or slightly stiffer) ride that the car has.

The paved roads I typically drive are very rough, wash board would be an understatement. This is mentioned to give more information for better guidance and suggestions.
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post #8 of 24 (permalink) Old 10-06-2019, 10:05 AM
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I know this isn't much help, but it's all I could find about your springs.
6TS Spring - Computer Selected, FRT, LH
7TN Spring - Computer Selected, FRT, RH
I got it from here: Caprice Classic dot COM -- Some SPID codes for 9C1 Caprice's
My thought is you're going to have to rely upon the wisdom on this forum.
Best of luck.

Mark: Snowman-33

93 9C1: Work & Cubic Ca$h This started with a new headlight and fender Celeritas In Conficiendo
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post #9 of 24 (permalink) Old 10-07-2019, 08:02 AM
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Ok, did some updating on my spreadsheet to add in the GM springs. The info of 0.2 inches per spring looks to hold pretty true.


A TN spring would be 440 lbs/in @ 16.84" for an installed height of 12.09
A TS spring would be 440 lbs/in @ 16.64" for an installed height of 11.89
all things being equal


For reference, the factory impala spring has a 11.31 installed height in my latest spreadsheet. If the one you're looking at has that number at the top, then the quoted heights would be right. Older spreadsheets would have different numbers.


So, if you want an inch drop as stated, you'd be looking for a roughly 11.39-11.59 installed height.
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post #10 of 24 (permalink) Old 10-07-2019, 12:50 PM
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Get a set of original springs from the junk yard. You can get all 4 for less than a pair of new ones. Rears are easy to replace. You then have a set that matches. If you want the front to be lower, cut a half coil off of the front springs.

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