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heres a list of common springs and their rates...
Stock Mustang and Aftermarket Mustang spring rates.
Rate(lb/in) Drop(in.)
PartNo. front rear front rear
'87 Mustang 2.3L 370 160
'87-93 Mustang 5.0 425-530 200-300
'93 Mustang Cobra 425-530 160
'93 Mustang Cobra R 750-850 240-260
'94-95 Mustang Cobra 400 160
'95 SVT Cobra R M-5310-R58 700-850
M-5560-R58 200-260
'96-98 Mustang Cobra 400-505 165-265
'99-04 Mustang V6 OEM 400 190
'99-04 Mustang GT OEM 450 210
2000 SVT Cobra R (Eibach) M-5310-R00 800
M-5560-R00 750 (IRS)
2001 SVT Cobra OE M 500 470 (IRS)
2001 Bullitt 1R3Z-5310-CA (front) 600
1R3Z-5560-AA (rear) 250 0.75 0.75 1R3C-5560-AA ?
2003 Mach 1 3R3Z-5310-AA (front) 600 3R33-5310-CA, 3R33-5310-AA ?
3R3Z-5560-AA (rear) 250 0.50 0.50 3R33-5560-BB
2003 SVT Cobra (Conv.) OEM 500 470 (IRS)
2003 SVT Cobra Coupe OEM 600 600 (IRS)
BBK Progressive BBK2510 ?? ?? 1 0.8
Dech Speeddrive 1000-1200 210-280 1.5"
Eibach Prokit 425-530 200-300 1.50 1.50
Eibach ProKit Convertible 460-570 170-310 1.5 1.5
Eibach ProKit Coupe 460-570 200-250 1.50 1.50
Eibach Racekit 700-850 200-260
Eibach Sportline 425-630 140-295 2.00 2.00
Ford Motorsports B M-5300-B 425-530 200-300 1.50 0.75
Ford Motorsports C M-5300-C 650 200-300 1.50 0.75
Ford Motorsports F M-5300-F 460-570 200-250 1.50 1.50
Ford Motorsports G (Conv.) M-5300-G 460-570 170-310 1.50 1.50
Ford Motorsports R M-5300-R 700-850 200-260
Global West 800 160 1 1
Global West Comp 1000 160 1 1
Global West Drag 680 160 1 1
H&R Cobra Convertible Race 750-850 770 (IRS)
H&R Cobra Coupe 700-760 685 (IRS)
H&R Cobra Vert Super Sport 700-760 685 (IRS)
H&R Race 750-850 260-280 1.25 1.00
H&R Sport 490-575 250-285 1.60 1.50
H&R Super Race 950-1050 260-300 1.25 1.25
H&R Super Sport Coupe 51652-77 700-760 275-300 1.75 1.60
H&R Super Sports Vert 51658-77 700-760? 275-300? 2 1.6
Intrax 2 2
Jamex 450-550 170-220 1.5 1.5
Jamex Sportsprings 425-450 180-225 1.50 1.50
Kenny Brown 650 800 (IRS) 2 1.25
MAC Progressives 450-520 200-230
MRT MRT-301 650 200-250 1.25 1.25
Progress 580 250-300 1.75 1.75
Saleen (Eibach ProKit?) 460-570 200-250
Roush Sport SM01-37X0-V8 1.50 0.80
Steeda Competition 555-8240 750-850 250 1.25 1.25
Steeda Full Comp [front] 121-4540-001 850-1050 N/A 1.50 N/A
Steeda Sport 223-9004 650 200-250 1.25 1.25
Suspension Tech Street 725 230
Suspension Tech Comp 850 280
Stock Mustang and Aftermarket Mustang spring rates.
Rate(lb/in) Drop(in.)
PartNo. front rear front rear
'87 Mustang 2.3L 370 160
'87-93 Mustang 5.0 425-530 200-300
'93 Mustang Cobra 425-530 160
'93 Mustang Cobra R 750-850 240-260
'94-95 Mustang Cobra 400 160
'95 SVT Cobra R M-5310-R58 700-850
M-5560-R58 200-260
'96-98 Mustang Cobra 400-505 165-265
'99-04 Mustang V6 OEM 400 190
'99-04 Mustang GT OEM 450 210
2000 SVT Cobra R (Eibach) M-5310-R00 800
M-5560-R00 750 (IRS)
2001 SVT Cobra OE M 500 470 (IRS)
2001 Bullitt 1R3Z-5310-CA (front) 600
1R3Z-5560-AA (rear) 250 0.75 0.75 1R3C-5560-AA ?
2003 Mach 1 3R3Z-5310-AA (front) 600 3R33-5310-CA, 3R33-5310-AA ?
3R3Z-5560-AA (rear) 250 0.50 0.50 3R33-5560-BB
2003 SVT Cobra (Conv.) OEM 500 470 (IRS)
2003 SVT Cobra Coupe OEM 600 600 (IRS)
BBK Progressive BBK2510 ?? ?? 1 0.8
Dech Speeddrive 1000-1200 210-280 1.5"
Eibach Prokit 425-530 200-300 1.50 1.50
Eibach ProKit Convertible 460-570 170-310 1.5 1.5
Eibach ProKit Coupe 460-570 200-250 1.50 1.50
Eibach Racekit 700-850 200-260
Eibach Sportline 425-630 140-295 2.00 2.00
Ford Motorsports B M-5300-B 425-530 200-300 1.50 0.75
Ford Motorsports C M-5300-C 650 200-300 1.50 0.75
Ford Motorsports F M-5300-F 460-570 200-250 1.50 1.50
Ford Motorsports G (Conv.) M-5300-G 460-570 170-310 1.50 1.50
Ford Motorsports R M-5300-R 700-850 200-260
Global West 800 160 1 1
Global West Comp 1000 160 1 1
Global West Drag 680 160 1 1
H&R Cobra Convertible Race 750-850 770 (IRS)
H&R Cobra Coupe 700-760 685 (IRS)
H&R Cobra Vert Super Sport 700-760 685 (IRS)
H&R Race 750-850 260-280 1.25 1.00
H&R Sport 490-575 250-285 1.60 1.50
H&R Super Race 950-1050 260-300 1.25 1.25
H&R Super Sport Coupe 51652-77 700-760 275-300 1.75 1.60
H&R Super Sports Vert 51658-77 700-760? 275-300? 2 1.6
Intrax 2 2
Jamex 450-550 170-220 1.5 1.5
Jamex Sportsprings 425-450 180-225 1.50 1.50
Kenny Brown 650 800 (IRS) 2 1.25
MAC Progressives 450-520 200-230
MRT MRT-301 650 200-250 1.25 1.25
Progress 580 250-300 1.75 1.75
Saleen (Eibach ProKit?) 460-570 200-250
Roush Sport SM01-37X0-V8 1.50 0.80
Steeda Competition 555-8240 750-850 250 1.25 1.25
Steeda Full Comp [front] 121-4540-001 850-1050 N/A 1.50 N/A
Steeda Sport 223-9004 650 200-250 1.25 1.25
Suspension Tech Street 725 230
Suspension Tech Comp 850 280
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