1989 Corvette C4:
New Six Speed Manual Transmission

The big news for 1989 was the completely new six speed manual transmission. It was designed for the Corvette by Zahnradfabrik Friedrichshafen A.G. (ZF) a German transmission builder with an excellent background for producing bulletproof transmissions for high horsepower applications. It replaced the "4+3" manual plus overdrive Doug Nash unit that first appeared in 1984 Corvettes. It was a no-cost option (the four speed automatic was standard) with improved shifting characteristics as part of the bargain.

Similar in some ways to the overdrive function of the "4+3" manual, the new transmission featured a Computer Aided Gear Selection (CAGS) system. Under certain circumstances (engine warmed up, less than 35% throttle) shifting up from first caused fourth gear to be selected. Any other circumstances (in other words, spirited driving) caused the transmission to behave like a conventional six speed. The goal was improved fuel economy and the system resulted in an EPA rating of 16 mpg city / 25 mpg highway rating - and once again the Corvette was not subjected to the gas guzzler tax.

1989 Corvette For Sale
Triple Black AT 42k Miles Runs Price: $12,000 obo Exterior: Blk Interior: Blk Miles: 42,532 Location: Japan *ZIP 302-0001 Click Here for more info
Second Owner all original except adjustable Coil overs all around + Full aero Kit. Starts every time, shifts correct, no hesitations (more)