Did the SDs have different spring rates? I don't think so. There's nothing SD specific on those cars aside form the engine. The SD or SE in later years just makes a regular part cost more. I have a set of NOS or NORS springs. I'll have to check them out for markings. Ships from NJ.
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1972 HO Trans Am auto White/white
1974 SD Trans Am 4 spd, no a/c dk blue/ white & blue
1978 Trans am gold/ black ,T56, t tops, EFI 474,
Build: http://www.pro-touring.com/showthrea...1978+g+machine
1999 30th Trans Am 6 spd, T top
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