The Vehicle Identification Number plate (VIN) has similar information to the trim tag such as the model, year, and assembly plant. One difference is the last six numbers relating to the assembly plant sequence as opposed to the trim tag's Fisher Body sequence and the series will designate a 6-cyl (odd 3rd digit) or V8 (even 3rd digit) on the VIN plate where the 3rd digit on the trim tag does not.

This VIN reads 138176A108948 and is for an SS396 2-door sport coupe assembled in Atlanta, GA. and is the 8,948th model sequenced at the plant for 1966.

First Character: Division of General Motors
1 - Chevrolet

Second and Third Character: Series Designation
31 - Chevelle 300, 6-cylinder
32 - Chevelle 300, 8-cylinder
33 - Chevelle 300 Deluxe, El Camino (Deluxe), 6-cylinder
34 - Chevelle 300 Deluxe, El Camino (Deluxe), 8-cylinder
35 - Malibu, El Camino (Custom), 6-cylinder
36 - Malibu, El Camino (Custom), 8-cylinder
37 - Concours, 6-cylinder
*38 - SS 396, Concours,  8-cylinder

Fourth and Fifth Character: Body Style/Model
11 - 2-door sedan
*17 - 2-door sport coupe
35 - 4-door station wagon, 2 seats
36 - 4-door station wagon, 2 seats, dual tailgate
39 - 4-door sport sedan
67 - 2-door convertible
69 - 4-door sedan
80 - 2-door sedan pickup

Sixth Character: Year of Production
6 - 1966

Seventh Character:
Final Assembly Plant
*A ~ Atlanta, Georgia
B ~ Baltimore, Maryland
Z ~ Fremont, California
F ~ Flint, Michigan
G ~ Framingham, Massachusetts
K ~ Kansas City, Missouri

Eighth through Thirteenth Characters: Sequential Production Number
The sequential starting number for the 1966 Chevelle was 100001 at all U.S. Chevelle assembly plants. Each assembly plant sequenced Chevelles of all series/models without regard to specific series/models. For example, if a series 13435 station wagon followed a 13667 Malibu convertible, the sequence number would be one unit higher for the wagon. It's also entirely possible to have the same sequence number from all six 1966 U.S. assembly plants with the only difference between the VINs being the plant code.

Production at the Kansas City plant exceeded 100,000 units sometime in early June so the VIN sequence from that time frame to the end of production would be 2nnnnn for the Kansas City plant.