Page 442 - 2021-22 Auto Performance_Circle Track

Conventional Coil Springs
Front Springs - Blue Powder Coated
5" I.D. x 5" Tall
Rear Stacking Springs
Springs allow conventional rear primary spring to be stacked with a secondary spring to create a tunable series/dual-rate spring assembly, making for a softer initial spring rate and stiffer secondary rate. Requires an aftermarket spring coupler for proper operation.
Rate Part No.
Progressive
Pull Bar Springs

Rate
5.0" O.D. 9.5" Tall Y Prefix
5.0" O.D. 9.9" Tall Y Prefix
5.0" O.D. 10.5" Tall Y Prefix
5.5" O.D. 9.5" Tall Z Prefix
5.5" O.D. 11" Tall Z Prefix
5.5" O.D. 12" Tall Z Prefix
300 HYP18Y0300 — — HYP18Z0300 — —
350 — HYP18Y0350-9.9 HYP18Y0350-10.5 HYP18Z0350 — —
375 — HYP18Y0375-9.9 — — — —
400 — HYP18Y0400-9.9 HYP18Y0400-10.5 HYP18Z0400 — —
425 — HYP18Y0425-9.9 — — — —
450 — HYP18Y0450-9.9 HYP18Y0450-10.5 HYP18Z0450 — —
475 — HYP18Y0475-9.9 — — — —
500 HYP18Y0500 HYP18Y0500-9.9 — HYP18Z0500 — —
525 HYP18Y0525 — — — — —
550 HYP18Y0550 HYP18Y0550-9.9 — HYP18Z0550 — —
575 HYP18Y0575 — — — — —
600 HYP18Y0600 — — HYP18Z0600 — —
625 HYP18Y0625 — — — — —
650 HYP18Y0650 — — HYP18Z0650 — —
700 HYP18Y0700 — — HYP18Z0700 — —
750 HYP18Y0750 — — HYP18Z0750 — —
800 HYP18Y0800 — — HYP18Z0800 HYP18Z0800-11 HYP18Z0800-12
850 HYP18Y0850 — — HYP18Z0850 — —
900 HYP18Y0900 — — HYP18Z0900 HYP18Z0900-11 HYP18Z0900-12
950 HYP18Y0950 — — HYP18Z0950 — —
1000 HYP18Y1000 — — HYP18Z1000 HYP18Z1000-11 HYP18Z1000-12
1050 HYP18Y1050 — — HYP18Z1050 — —
1100 — — — HYP18Z1100 HYP18Z1100-11 HYP18Z1100-12
1200 — — — HYP18Z1200 HYP18Z1200-11 HYP18Z1200-12
1300 — — — — HYP18Z1300-11 HYP18Z1300-12
1320 — — — HYP18Z1320 — —
1440 — — — HYP18Z1440 — —
200
HYP18SS-200
300
HYP18SS-300
400
HYP18SS-400
Part No.
HYP600-1200 HYP900-1300
Description
600/1,200 900/1,300
Rear Springs - Blue Powder Coated - Flat Both Ends
Linear Conventional
Pull Bar Spring HYP1225PB
Spring is 5" O.D. x 6.625" free length.
Detroit Locker Spring
HYPLOCKERSPRG
Directly replaces the stock spring in Ford 9" rear ends with Detroit Lockers.
Composite Leaf Springs

lighter than steel with quicker response, higher yield strength and better retention. Springs are molded to the exact shape to resist relaxing. Initial costs are greater, but composite springs
5.0" O.D. 11" Tall Rate SN Prefix
5.0" O.D. 13" Tall S Prefix
5.0" O.D. 16" Tall SNU Prefix
5.0" O. 20" SNT
50
—
—
HYP18SNU-050
HYP18SNT-050
80
—
—
—
HYP18SNT-080
85
—
—
HYP18SNU-085
—
100
—
HYP18S-100
HYP18SNU-100
HYP18SNT-100
125
HYP18SN-125
HYP18S-125
HYP18SNU-125
HYP18SNT-125
150
HYP18SN-150
HYP18S-150
HYP18SNU-150
HYP18SNT-150
165
—
HYP18S-165
—
—
175
HYP18SN-175
HYP18S-175
HYP18SNU-175
—
185
—
HYP18S-185
—
—
200
HYP18SN-200
HYP18S-200
HYP18SNU-200
—
225
HYP18SN-225
HYP18S-225
HYP18SNU-225
—
250
HYP18SN-250
HYP18S-250
HYP18SNU-250
—
275
HYP18SN-275
HYP18S-275
—
—
300
HYP18SN-300
HYP18S-300
—
—
325
HYP18SN-325
HYP18S-325
—
—
350
HYP18SN-350
HYP18S-350
—
—
400
HYP18SN-400
—
—
—
450
HYP18SN-450
—
—
—
Part No.
Rate Arch
Front Bolt Dia.
Rear Bolt Dia.
Chrysler Composite Leaf Springs
HYP10230
175
4.5"
.625"
.500"
HYP10231
200
4.5"
.625"
.500"
HYP10240
225
4.5"
.625"
.500"
Chevy Camaro Composite Leaf Springs
HYP11340
175
4.5"
.562"
.500"
HYP11342
200
4.5"
.562"
.500"
HYP11344
225
4.5"
.562"
.500"
HYP11348
250
4.5"
.562"
.500"
Corvette C4 Rear Composite Leaf Spring
HYP12411HPS*
228
—
—
—
Rear Pigtail Springs
Rate
Single Pigtail 5.5" O.D., 11" Tall SNP Prefix
Single Pigtail 5.5" O.D., 12" Tall SNP Prefix
Double Pigtail 7" O.D., 14" Tall SDP Prefix
*Signifies high-performance street, EZ Ride series spring.
175
HYP18SNP11-175
HYP18SNP12-175
HYP18SDP-175
200
HYP18SNP11-200
HYP18SNP12-200
HYP18SDP-200
225
HYP18SNP11-225
HYP18SNP12-225
HYP18SDP-225
250
HYP18SNP11-250
HYP18SNP12-250
—
275
HYP18SNP11-275
HYP18SNP12-275
—
300
—
HYP18SNP12-300
HYP18SDP-300
440 TRACK
CIRCLE 2021-22
TECH TIP
Conventional Coil Springs Reference
• 5" front springs fit 1964-72 Chevelle, 1967-69 Camaro, and 1968-74 Nova • 5-1/2" front springs fit 1973-up Chevelle, 1970-up Camaro, 1975-up Nova,
and most Fords