The 8-speed GM transmission has often been criticized for exhibiting shuddering and harsh shifts, but a new fluid flush may fix the issue outright.

For example, each quart of C8 Corvette transmission fluid currently costs $42.90, which means adding about $100 to every 2020 Corvette produced if GM added the extra fluid at the factory.

Q:I have a 1990 Chevy SS454 pickup truck with 191,000 miles.It's time to change the transmission fluid again. The information in the manual says to use Dextron II, but the last time I had it ...