The 6-speed manual transmission, the Borg Warner Modified T-56 (RPO MM6), is stamped with a VIN derivative, which will be located in either the primary or secondary location, as shown. For additional information, refer to VIN Derivative .
The 4-speed overdrive automatic transmission, the Hydra-Matic 4L60-E (RPO M30), has two indentifying stampings or laser etchings:
The transmission identification (ID) number indicates the transmission model type and when the unit was built. The transmission ID number is located on the bottom of the case just rear of the oil pan.
Position
Definition
Character
Description
1
Model Year
7
1997
2-3
Model
YD
Corvette
4
Transmission Type
D
HYDRA-MATIC 4L60-E
5
Calendar Year
6-8
Julian Date (or Day of the Year)
--
9
Shift Build
A VIN derivative will be located in either the primary or secondary locations, or the optional locations as shown. For additional information, refer to VIN Derivative .
