From Rockland Standard Gear web site:
Rockland Standard Gear (RSG) remanufacture the ZF S6-40 transmission found in the C4 Corvettes from 1989 to 1996. RSG remans these transmissions for ZF and GM and are the only source for these parts in North America. We can also repair or remanufacture your Corvette transmission if you wish to keep your part numbers intact for collector value. We stock complete new transmissions, remanufactured transmissions and a complete line of O.E. ZF parts.
http://www.rsgear.com
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