The International Syclone Typhoon Registry is a non-profit organization focused on GMC Syclone, Typhoon, & Sonoma GT sportmachine trucks. ISTR was established by truck owners to preserve the history and maintain a community focused on driving and enjoying these unique and rare production trucks.
We aim to provide the most accurate historical, data, and technical information for these trucks. Along with sharing data, we actively help owners with the preservation of their trucks. The information found on this website is the collective work of owners and enthusiasts who have researched and documented their findings.
ISTR offers an exclusive source of news and data that is updated often via our social media platforms and website. We are dedicated to sharing relevant information and fostering a shared enthusiasm for owning and enjoying these rare and unique trucks.
ADVERTISING & SPONSORSHIP
Interested in advertising or becoming a sponsor on ISTR?
Contact sytyregistry@gmail.com
ISTR is a non-profit organization owned and operated by owners and enthusiasts of the GMC Syclone, Typhoon, and Sonoma GT. Information provided on this site is a combined effort of years of research by individuals who have the time to acquire accurate information and data on these unique trucks.
If you would like to make a contribution towards ISTR and help continue to make this information available for FREE on this site, please help us out!
CREDENTIALS
We request that all information taken from this website to be used in all printed or digital media be appropriately credited back to the International SyTy Registry and all respective owners. ISTR is not sponsored, affiliated, or otherwise connected to any of the manufacturers named on our website. ISTR’s use of any registered trademark or licensed photo is for identification purposes and is the property of their respective owners.
We are the biggest and best source for the GMC Syclone, Typhoon, and Sonoma GT trucks! Thank you to those who contribute to our community.