"What are the most common problems with the 1988 Corvette's C4 transmission?"

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Accepted Answer

The '88 Corvette came with two very different transmissions, and each has its own "personality quirks."

If it's an automatic (700-R4):
- Torque-converter lock-up likes to fail—feels like driving over rumble strips at 45-50 mph
- Runs hot in traffic; a good cooler is cheap insurance
- Governor can wear and give you lazy 1-2 shifts
- Forward piston cracks, then it slips in 2nd/3rd

If it's the Doug Nash 4+3 manual:
- The little overdrive unit behind the main box leaks; once ATF and gear oil mix, the overdrive dies
- Solenoid/relay for the overdrive is getting old and can quit
- Clutch fork gets tired after 30-plus years

Good news: both boxes are well supported by the aftermarket, and a lot of the fixes are weekend projects if you plan ahead. Want me to dig up some parts sources or find you a low-mileage example that's already had the work done?

Lot N1353: 1988 Chevrolet Corvette

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Lot N1353: 1988 Chevrolet Corvette

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