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Hello, Does anyone happen to know the factory front and rear spring rates for a 1995 Caprice LT1 B4U w/ the FE3 package and tow pack? Spring tag on rears is THH. I have heard that these are the stiffest factory spring put on 94-96 B-Bodies including Impala SS and 9C1's. Is this true? Car does ride like a truck...Which is OK...Has Monroe Severe Service shocks also that I put on...Thank you, Uvaldi..
 

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Hello, Does anyone happen to know the factory front and rear spring rates for a 1995 Caprice LT1 B4U w/ the FE3 package and tow pack? Spring tag on rears is THH. I have heard that these are the stiffest factory spring put on 94-96 B-Bodies including Impala SS and 9C1's. Is this true? Car does ride like a truck...Which is OK...Has Monroe Severe Service shocks also that I put on...Thank you, Uvaldi..
Here is a page from the GM parts books on spring application and order of stiffness?
Also the orig part numbers are listed.
I have 2 B4U Caprice's,and it appears that the FE3 springs are not the most heavy duty spring listed.Fall somewhere in the middle to upper range according to the spring codes.

Both my FE3 B4U's have same spring codes with rears both sides being HH. The fronts are have different ratings,with the pass front being slightly higer rating of TN,and driver side one below that at TS. I think the TN pass side spring is a pinch higher rated because of the accessory stack on pass front of engine.
Hope this helps,Jim
 

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Discussion Starter #3
Thanks for the list. Good info. I am still confused however. Was I looking at the wrong tag on the rear spring? It does say THH on my cars rear spring paper tag.
 

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That's the correct tag. It's just the last two characters used to ID. The tag will have the 8 digit part number too, if you can still read it.

You have the stiffest springs available. If you look at the page. There are only 2 rates (stiffnesses) for the fronts 53 or 77n-m. Don't confuse 'load rate' with stiffness. It only tells you which springs sit higher. Or more correctly, which can handle a heavier load to keep same height.
But if you don't change the weight, then the lowest load rate will sit the lowest and vice versa.

For the rear, there is only 18 and 27 not including the wagons. Only FE1 cars have the soft springs.
 

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Discussion Starter #6
Do you happen to know the rating for the 9C1 front springs? Is that higher or lower then 77 n/mm?
 

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The 1993 page has them grouped in with all the other 77N/MM springs. Oddly, they are shown to have the lowest load ratings.

Makes me think it was a typographical error and should have been at the top of the chart.
I believe the SD spring is the tallest.
 
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