Why It Matters
A wide-ratio four-speed was standard; M21 and M40 Turbo Hydra-Matic were alternatives. Both Muncie and Borg-Warner Super T-10 ratios appear in year-specific references, so case, stamp or tag, date, ratio, shifter, linkage, drivetrain compatibility, and paperwork must agree.
Also Known As
1974 Corvette four-speed1974 Corvette M211974 Corvette Super T-101974 Corvette Turbo Hydra-Matic
