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Don't know the rates but the 164 springs are significantly stronger than the 140 springs. There's 50% more engine and a longer nose to support with the 164. The crossmember design is essentially the same between the two cars.
In my opinion it never was beefy enough for the 164- my wife's first car, a 75 164, used to chew up idler arm bushings like they were candy.
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Rob Bareiss, New London CT ::: 87 244DL- 249K, 88 245DL- 181K, 84 242DL, 89 244DL parts, SOLD: 86 244, 88 244GL, 87 244, 91 244, 82 245T, 88 744GLE, 86 244
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