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The RPO MN6 manual transmission no-cost option for 1989 was a new six-speed designed jointly by Zahnradfabrik Friedrichshafen (ZF) and Chevrolet and built by ZF in Germany. A computer-aided gear selection (CAGS) feature bypassed second and third gears (and locked out fifth and sixth) for improved fuel economy in specific non-performance conditions.
The 6-slot,16x8.5-inch wheel was discontinued for 1989 and
replaced with a 12-slot, 17x9.5-inch wheel from the 1988 ZR-1 and
Z52 options became standard for 1989.
On April 19, 1989, Chevrolet advised dealers that the ZR-1 would be a 1990 model, not a late-release 1989 due to "insufficient availability of engines." About 100 1989 ZR-1 Corvettes were built for evaluation, testing, and media preview and photography, but none were release for public sale.
Seats were restyled, but the three choices of cloth, optional leather, or optional sport leather continued. Due to weight and fuel economy concerns, Chevrolet intentionally limited sales of the sport leather seats by making them available exclusively with Z51-optioned models.
No new colors were added for 1989 with the exception of the code for White changed from 40 to 10.
Gone from 1988 were 2 colors: Yellow (code 35) and the coupe only White/Black (code 40/41).
1989 window sticker example
1989 build sheet example
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