International SyTy Registry

GMC Syclone, Typhoon, & Sonoma GT History and Data

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Thank you for your interest in the International Syclone Typhoon Registry. If you would like to assist and help in the submission of data, specifications, historical information, or help organize materials on ISTR, please contact us.

The ISTR’s goal is to provide technical and accurate data surround the GMC Syclone, Typhoon or Sonoma GT. If you have information that is not available or published on this site and would like to submit information to the registry to be scanned, photographed and documented, be sure to contact us regarding information on where to send your material(s). Please provide your contact information so that we may return your items and materials.

This site will be continually updated with information.  ISTR is privately owned and operated and not directly affiliated with General Motors or PAS (Production Automotive Services).


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