International SyTy Registry

GMC Syclone, Typhoon, & Sonoma GT History and Data

Welcome to ISTR

ISTR_Logo_BGWelcome to the new website for the International Syclone Typhoon Registry (ISTR). This site was built to educate, inform, and share knowledge about the famed 1991-1993 GMC Syclone, Typhoon, and Sonoma GT trucks.

ISTR was built with the intentions to take known data and information and be able to collectively share it amongst owners and enthusiasts. With that, we are working to build a database of trucks that includes information such as known factory data, current & past location(s), living or dead (wrecked beyond repair), as well as other miscellaneous truck information that can provide further information on the Syclone, Typhoon, and Sonoma GT.


Our goal is to act as a professional network of owners and enthusiasts that provides valued and accurate information about these special and rare sport trucks, and preserve any historical data regarding the sportmachines. Along with informative data, this site will provide as a home to cover any SyTySoGT related events, provide news and updates, how-to articles, and published articles featuring owner’s projects or finished trucks.

This is a huge project that will continue to expand and grow with time. If you would like to help be a part of ISTR and provide accurate data towards building this site or would like to have your truck(s) featured in a future story or article, please contact us.

ISTR Update – We would like to announce that memberships are now available through the ISTR Store and offers 2 option of membership packages, Premium and Standard.

By becoming an *ISTR Premium Certified Member, you will receive:

  • ISTR T-Shirt
  • ISTR Membership Card (Personalized with your name and ISTR ID #)
  • ISTR Decals
  • ISTR Storm Sighting Cards
  • Enhanced Forum Access
  • Automatic Entry in ISTR Members Only Giveaways
  • High quality copies of the official PAS Build sheet(s) for your truck, a $25 Value!

By becoming an *ISTR Standard Certified Member, you will receive:

  • ISTR T-Shirt
  • ISTR Membership Card (Personalized with your name and ISTR ID #)
  • ISTR Decals
  • ISTR Storm Sighting Cards
  • Enhanced Forum Access
  • Automatic Entry in ISTR Members Only Giveaways
PURCHASE YOUR MEMBERSHIP PACKAGE HERE!

No comments so far.

Be first to leave comment below.

Your email address will not be published. Required fields are marked *