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#1 |
![]() Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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This should be a sticky.... courtesy of Hib Halverson, found this researching for a friend. Thank you Hib!
It seems I have an FHA on my 90’. H ![]() C4 Spring Code Chart compiled by Hib Halverson ©2007 Shark Communications Preface Notes: 1) GM had two RPO subsystems during the C4 era. There were engineering RPOs and marketing RPOs. What consumers knew as Z51 or Z07 was actually a combination of the FE3 (96) or FE7 (84-95) HD suspensions with other performance-related options. Some GM parts data refers to FE3 or FE7. When those RPOs are listed, it refers to cars optioned with either Z51 (84-91, 96) or Z07 (92-95). 2) In MY89-91, Selective Ride Control (SRC), which many refer to by its RPO, FX3, could be ordered in combination with Z51, however, a little-recognized production change which always occured in those MYs when those two RPOs were ordered together was a downgrade to base level (FE1) springs, front lower control arms and stabilizer bars. In those MYs the only conditions under which FE7 was present were; 1) if the car was ordered with Z51 and without FX3 or 2) it was an 90 or 91 Corvette Challenge car. 3) For MY92-95, FX3 and FE7 was added. A new RPO, Z07, was released for this combination. For MY92-95, FX3 was, also, available as a stand-alone option. Coupe, front* HMZ 84 w. Z51 BMB 84 base, 85-87 with w. Z51 HKX, HMP 85-87 base FHA 88-91 base, 89-91 w. FX3&Z51, ZR1* FHB 88-91 w. Z51 AA 90-91 w. ZR1* FSS 92-95 base, 92-93 w. FX3 FSK 92-95 w. Z07 FSM 92-95 w. ZR1* HA 94-95 w. FX3 22173028 96 base 17999032 96 w. Z51 Per Mark Haibeck all ZR1’s he has seen came with FHA. Convertible, front HMN 86-87 FHC 88-91 base, 89-91 w. FX3 FSR 92-95 base JA 94-95 w. FX3 22173029 95 w. FX3 17999031 96 Coupe, rear BMF 84 base BMH 84 w. Z51 NYR 85 base(?) 86-93 base, 89-90 w. FX3&Z51, 90-91 w. ZR1 NYU 85-91 w. Z51, 92-95 w. Z07 RHY 92-95 w. ZR1, 96 w. Z51 RHZ 94-96 base Convertible, rear RCA 86-96 22112254 94-95 w. FX3
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. Last edited by Ccmano; 04-24-2019 at 10:36 AM. |
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#2 |
![]() Join Date: May 2010
Location: Japan
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Thanks for posting Hans! I started trying to read this in bed waking up at 5:30 am Saturday. Hell with this and need to wake up and have coffee first.....too many codes for my brain LOL!!
Sent from my iPhone using ZR-1 Net Registry
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Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048 ![]() |
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#3 |
![]() Join Date: Sep 2008
Location: Mullica Hill, New Jersey
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Great post and information, and all seems 100% accurate.
However, try finding a 100% correct new replacement spring. They generally only offer 1 or 2 for the entire C-4 lineup, and the mounts / blocks are not already permanently fastened to the spring. Because of this we often try to find undamaged used springs, with the correct code, rather than getting the new replacements which often result in poor ride height, a change in ride quality, and "movable" mounts. Try explaining to the suppliers that you are searching for an FSM code new spring. p.s. If your ZR-1 is towed, DO NOT let them strap the car down by the frame rails, but rather have them only use tire/wheels straps!!! When they tighten up the straps on the frame, pulling the car down it makes the spring flex in an unorthodox way, often causing it to begin splitting leading to failure. Marty |
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#4 |
![]() Join Date: May 2007
Location: Addison IL
Posts: 241
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Hi Hans,
All ZR-1's have a FHA front spring. I have never seen AA or FSM springs. |
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#5 | |
![]() Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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H ![]()
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. |
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#6 | |
![]() Join Date: Oct 2017
Location: Tampa, FL / Rockledge, FL
Posts: 194
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Joel
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Joel Tampa/Rockledge, FL Present Collection 1969 350/300 AC Convertible 1972 454 Coupe 2nd Owner 1988 KOH EX5006 - ZR-1 Prototype 1990 ZR-1 #277 NCRS Dave McLellan Award 2019 1994 Copper Convertible NCRS Dave Hill Award 2012 2001 Z06 122k miles ![]() |
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#7 |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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Doing some research on ride heights brought me to this thread, I am attaching the build sheet to my 90 with an "AA" front spring. My car is early and also has steel half shafts. If anyone else has the AA spring (Joelbbvette) could you measure the front ride height?
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Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454 |
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#8 | |
![]() Join Date: Nov 2016
Location: New Brunswick
Posts: 951
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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#9 |
![]() Join Date: Jan 2006
Location: Decatur, AL
Posts: 1,112
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Thanks, I may have it figured out by then ..BTW the Flowmaster I sold ended up costing only $86 to ship UPS.
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Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454 |
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#10 | |
![]() Join Date: Nov 2016
Location: New Brunswick
Posts: 951
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Damn. That was good. I still haven't gotten an answer, after many attempts, to find the shipping and handling charges on this side of the border. We pay a lot for the privilege of living in Canada.
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1990 ZR-1 # 996 "All Corvettes are red. The rest are mistakes." - John Heinricy |
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