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What is the Guldstrand Mod?

What is the Guldstrand Mod?

Sometimes called the G-Mod or GS-Mod, Guldstrand Mod offers better cornering performance with no other changes to the stock suspension. The Guldstrand Mod is the process of relocating the stock upper control arm pivot by less than an inch, a modification that requires drilling four holes and very little else. It works for 1967-69 Camaro and Firebird, as well as 1968-74 Chevy II/Nova models.