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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.

Classic Industries Resurrects Rare Firebird Z20 Appearance Package

Firebird Z20 Spoilers Rise Like a Phoenix from the Ashes of Pontiac history.



Sales card describing Z20 Firebird Appearance Package to Pontiac Dealers

While owners of early F-bodies have access to reproduction and replacement parts for virtually any limited production package conceived, owners of Pontiac's third generation Firebird and Trans Am models have had to hunt for suitable used parts at junkyards, swap meets, online auctions, and message boards.