Chevrolet Chevy II Automatic Transmission Indicator Bulb Size

The Chevrolet Chevy II automatic transmission indicator requires bulb size 1445 or 257 depending on the specific application. Data for the bulb sizes covers the range from 1962 through 1968.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Type	Shop
1964-1968	1445	Check Price
1962-1963	257	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Single-filament bulb with BA9s base. 12V, 2W.	1445	Check Price
ANSI standard (US & Canada). Festoon or BA9s base instrument bulb. 12V, 2W.	257	Check Price

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Additional Notes

The Chevrolet Chevy II automatic transmission indicator used two distinct bulb types across its 1962-1968 model years: the 1445 and the 257, both classified under ANSI standards applicable to the US and Canadian markets.
Both the 1445 and 257 bulbs operate at 12 volts and 2 watts, placing them in the low-wattage instrument lighting category typical of dashboard indicator applications.
The 1445 bulb is a single-filament type with a BA9s base, a small bayonet-style fitting commonly associated with instrument panel and indicator lamp sockets.
The 257 bulb is specified with either a festoon or BA9s base, meaning it was produced in two physically distinct configurations despite sharing the same ANSI designation and electrical ratings.
The dual-base option of the 257 bulb is a fitment consideration, as a festoon-style bulb and a BA9s bulb are not mechanically interchangeable even when their voltage and wattage ratings are identical.
The 1445 bulb was used in the Chevrolet Chevy II for the 1964-1968 model years, representing the longer-running specification across this part's history in the vehicle.
The 257 bulb was specified for the 1962-1963 model years, after which the 1445 replaced it as the designated automatic transmission indicator bulb.
Although the 1445 and 257 share the same voltage and wattage ratings, the 1445 specifies only the BA9s base, making it a more defined fitment compared to the dual-base 257.