1989-1997 Thunderbird Lowering Springs

Everyone knows that a lowered car looks better and the suspension aftermarket offers several choices for the 89-97 Thunderbirds. Companies offering spring kits for the 89-97 Thunderbirds are Eibach, H&R, Tokico, Suspension Techniques, and Jamex (pronounced 'yamex').


The Thunderbird spring rates are listed by year and application below.
Year
3.8L
3.8L SC
V8
1989
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
Front: 349-403 lb./in.
Rear: 509-637 lb./in.
N/A
1990
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
Front: 349-403 lb./in.
Rear: 509-637 lb./in.
N/A
1991
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
Front: 349-403 lb./in.
Rear: 509-637 lb./in.
Front: 270-330 lb./in.
Rear: 361-501 lb./in.
1992
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
Front: 349-403 lb./in.
Rear: 509-637 lb./in.
Front: 270-330 lb./in.
Rear: 361-501 lb./in.
1993
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
Front: 349-403 lb./in.
Rear: 509-637 lb./in.
Front: 270-330 lb./in.
Rear: 361-501 lb./in.
1994
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
Front: 349-403 lb./in.
Rear: 509-637 lb./in.
Front: 270-330 lb./in.
Rear: 361-501 lb./in.
1995
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
Front: 349-403 lb./in.
Rear: 509-637 lb./in.
Front: 270-330 lb./in.
Rear: 361-501 lb./in.
1996
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
N/A
Front: 270-330 lb./in.
Rear: 361-501 lb./in.
1997
Front: 223-282 lb./in.
Rear: 361-501 lb./in.
N/A
Front: 270-330 lb./in.
Rear: 361-501 lb./in.
LX Sport Option:
Front: 349-403 lb./in.
Rear: 509-637 lb./in.

Definitions:

Progressive Springs
Also know as rising-rate springs or variable springs are like two springs in one. The first small amount of suspension travel gets the softer rate, which helps filter out potholes, bumps, expansion joints, and ruff road surfaces. After the first inch of compression the spring rate switches to the higher stiffer rate.
Linear Springs
A linear-rate spring is designed with an amount of resistance in its first inch of compression that doubles with the next inch of suspension compression, triples with the next inch, and so on.
Freelength
Freelength is the hight of the spring uncompressed.

Front and rear stock anti-sway bar information is available. Click Here


Eibach

Eibach-ProKit springs are of the progressive design and offer chrom silicon heat treated steel that is powder coated for a lifetime of protection. Eibach offers two versions of their ProKit for the 89-97 Thunderbird. One is designed for the v6 3.8L normally aspirated (part#3522.140) and is designed to lower the car 1.25" with a front spring rate of 286-411 lbs per inch and a rear spring rate of 514-714 lbs per inch. The freelength of the springs are 16.375" for the front and 11.625" for the rear. The other ProKit is designed for the v8 & Super Coupe (part#3524.140) and is designed to lower the car 1.50" with a front spring rate of 286-411 lbs per inch and a rear spring rate of 514-714 lbs per inch. The freelength of the springs are 16.125" for the front and 11.4375" for the rear. Eibach makes their springs in the USA and the average discounted price for the springs are around $225.00 - $250.00 and come with a lifetime warranty against defects in workmanship and materials.
Eibach Springs
17817 Gillette Ave.
Irvine, CA 92714
Tel: (714) 752-6700
fax: (714) 752-6788
http://www.eibach.com

H&R

H&R springs are of the progressive design and are made from Bekaert wire from Belgium. The Bekaert wire is used exclusively because in durability testing, the Bekaert wire alloy has a much longer service life than any other wire tested. These materials ensure a defect-free function over the entire service life. H&R offers two versions of their Sport Springs for the 89-97 Thunderbird. One is designed for the v6 3.8L normally aspirated (part#51623) and is designed to lower the car 1.60" in front and 1.40" in the rear with a front spring rate of 310-385 lbs per inch and a rear spring rate of 540-610 lbs per inch. The freelength information was not available. The other Sport Spring is designed for the v8 & Super Coupe (part#51624) and is designed to lower the car 1.50" in front and 1.40" in the rear with a front spring rate of 310-385 lbs per inch and a rear spring rate of 540-610 lbs per inch. The freelength of the springs are 16.25" for the front and 12.00" for the rear. H&R makes their springs in Germany and the average discounted price for the springs are around $225.00 - $250.00 and come with a lifetime warranty against defects in workmanship and materials.

H&R Special Springs, LP
3815 Bakerview
Spur #7
Bellingham, WA 98226
888-827-8881
(360) 738-8881
fax: (360)738-8889

Tokico

Tokico-Sport Lowering Springs are of the linear design and offer cold wound steel that is powder coated for a lifetime of protection. Tokico offers one kit for the 89-97 Thunderbird and it is designed to lower the car 1.25". The front spring rate is 326 lbs per inch and the rear spring rate is 577 lbs per inch with a freelength of 15.70" in front and 11.07" in the rear. Tokico makes their springs in the USA and the average discounted price for the springs are around $225.00 - $250.00 and come with a lifetime warranty against defects in workmanship and materials.

Tokico
1330 Storm Parkway
Torrance, CA 90501
(310) 534-4934

Suspension Techniques

Suspension Techniques-Sport Sport Suspension springs are of the linear design and offer cold wound steel that is powder coated for a lifetime of protection. Suspension Techniques offers one kit for the 89-97 Thunderbird and it is designed to lower the car 1.50". The front spring rate is 432 lbs per inch and the rear spring rate is 631 lbs per inch with a freelength of 14.33 in front and 10.89" in the rear. Suspension Techniques makes their springs in the USA and the average discounted price for the springs are around $220.00 - $250.00 and come with a lifetime warranty to the original purchaser of the product that it will be free of manufacturing defects so long as such purchaser owns the vehicle on which such products were originally installed. The warranty is transferable by the original purchaser for a warranty period of five years from the original purchase date..

Suspension Techniques, Inc.
(A Belltech Company)
2822 East California Avenue
Fresno, California 93721
(800) 595-7016
California and outside US: (209) 266-9173
Fax: (209) 266-4348
http://www.belltechcorp.com

Jamex

Jamex-Sport Springs are of the progressive design and offer chrom silicon heat treated steel that is powder coated for a lifetime of protection. Jamex offers one kit for the 89-97 Thunderbird and it is designed to lower the car 1.50" - 2.00". The spring rate is listed as 15% stiffer than the OE v8 sport springs with a freelength of 17.00" in front and 11.50" in the rear. Jamex makes their springs in the USA and the average discounted price for the springs are around $125.00 and come with a lifetime warranty against defects in workmanship and materials.

Jamex
4975 C Energy Way
Reno, Nevada 89502
(702)857-4888
Fax (702) 857-1635
http://www.jamex.com