C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Rear Spring Codes? help with de-coding

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Old Jun 23, 2005 | 05:37 PM
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Default Rear Spring Codes? help with de-coding

They used a 3 letter code on the rear springs for differnt spring rates, it is stamped near one end on the side facing the pavement.

In 1984, they had two available, the FE1, and the Z51

Which one is coded with "BMF" ???
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Old Jun 23, 2005 | 08:12 PM
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BMF = base
BMH = HD, which I think would be the Z51
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Old Jun 23, 2005 | 08:37 PM
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The 1984 Corvette was available with 2 different rear springs. The standard equipment spring was coded, "BMF" and carried part number, 14045785. The "heavy duty" suspension was RPO "FE7". The FE7 suspension was a component of the Z51 handling package. The FE7 rear spring had code, "BMH" and carried part number 14045786.

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Old Jun 23, 2005 | 10:02 PM
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BMF = FE1 72.0 rate
BMH = FE7 87.5 rate
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Old Jun 23, 2005 | 10:14 PM
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
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'85 Z51 rear spring = NYU 005875
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Old Jun 24, 2005 | 11:56 AM
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Originally Posted by Z-07 freak

BMF = FE1 72.0 rate
BMH = FE7 87.5 rate
I'm not sure where that info came from. My 1984 Corvette Specifications Manual shows a little differently. The spring rate for the standard equipment rear spring is listed at 75.5 N/mm (Newtons per millimeter) or 431.0 lb/in. (pounds per inch). The FE7 spring is rated at, 91.8 N/mm or 525.0 lb/in. I also show the effective spring rate at the wheel, for anyone interested.

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Old Jun 24, 2005 | 05:10 PM
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Default How do you find this information?

Thanks for the replies, my 1st question has been answered!

Where would one find this information? I am aware of Hib Halversons chart elsewhere on the internet, BUT, if you are just looking at a spring, with a code and date of manufacture sticker, how do you know the spring rate?

NEXT QUESTION: Front Spring from a 1989, letter code stamped on it is "FHC" What is the spring rate? I do not know if it is from a FE1 car or an FE7 car
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Old Jun 24, 2005 | 07:09 PM
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Originally Posted by NASCAR314
Where would one find this information? BUT, if you are just looking at a spring, with a code and date of manufacture sticker, how do you know the spring rate?
To get the part number, I went to my Corvette Parts Book. As I posted, I got the spring rates from my "1984 Corvette Specifications Manual"



Originally Posted by NASCAR314
NEXT QUESTION: Front Spring from a 1989, letter code stamped on it is "FHC" What is the spring rate? I do not know if it is from a FE1 car or an FE7 car
1988-89, Y67 (convertible) with (for 1989) FE1, soft ride suspension, part number, 10048574. I don't have the spec manual for the 1988-1990's and therefore don't have the spring rates.

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Old Jun 24, 2005 | 08:47 PM
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Originally Posted by NASCAR314
if you are just looking at a spring, with a code and date of manufacture sticker, how do you know the spring rate?
Look at the website TravisD made http://www.tubas.net/vette/index.html about halfway down the page in the section Vette Tech Items, he has scanned in the Parts Fiches for the springs.
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Old Jun 24, 2005 | 10:37 PM
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From: Why are there squished peanut butter cups in my underware?
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FHC = front spring for;
1)`88-`91 FE1 convertibles
2) `90 & `91 FE1 w/ FX3 convertibles
3) `88 Z-52 verts
93.1 N/mm rate.
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