Transmission ID and VIN Derivative Location Corvette T56 and 4L60E
All engines and transmissions, as well as removable roof panels are stamped
or laser etched with a partial Vehicle Identification Number (VIN), which
was derived from the complete VIN. A VIN derivative contains the following
nine positions:
| • | Position 1 is the GM division identifier. |
| • | Position 2 is the model year code. |
| • | Position 3 is the assembly plant code. |
| • | Positions 4-9 contain the assembly plant sequential
number for the vehicle. |
A VIN derivative can be used to determine if a vehicle contains the
original engine, transmission or removable roof panel, by matching the VIN
derivative positions to their accompanying positions in the complete VIN:
| • | VIN derivative position 1 = VIN position 3 |
| • | VIN derivative position 2 = VIN position 10 |
| • | VIN derivative position 3 = VIN position 11 |
| • | VIN derivative positions 4-9 = VIN positions 12-17 |
Borg Warner T-56 Manual Transmission
The 6-speed manual transmission, the Borg Warner T-56 (RPO MM6), is stamped
with a VIN derivative on the LH side of the transmission case.
Hydra-Matic 4L60E Automatic Transmission
The 4-speed overdrive automatic transmission, the Hydra-Matic 4L60-E
(RPO M30), is stamped or laser etched with a transmission identification number
and a VIN derivative.
The transmission identification number provides the transmission model
and when it was built. The transmission ID number is located on the bottom
of the case just rear of the oil pan.
VIN Location
