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15psi in these tires is VERY low. I'm very surpised it works better at 15psi then it does at 18~20psi for you.

What suspension are you running?





I'm running CalTracs with HD springs, Mopar Performance shocks. They are several years old and although they have decent tread, I'm thinking their age is a problem (and just now looking at the tread, I noticed some cracking in the tread grooves).

1979 AMC Spirit, NHRA Q/SA