Toyota 4Runner Automatic Transmission Indicator Bulb Size

The Toyota 4Runner automatic transmission indicator bulb uses a 74 size bulb for this particular component. The replacement chart covers vehicle production spanning from 1984 to 1991.

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
1984-1991	74	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T5). 12V, 1.4W.	74	Check Price

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Additional Notes

The bulb size 74 is an ANSI-standardized miniature wedge bulb classified under the T5 designation, operating at 12 volts and drawing 1.4 watts.
The T5 designation refers to the bulb's tubular form factor, with the numerical value indicating its width in units of one-eighth of an inch, making it one of the smallest wedge bulb formats used in automotive instrument panel applications.
At 1.4 watts, the bulb size 74 draws very little power, which is typical for indicator and gauge illumination functions where heat output and electrical load must be kept minimal.
The Toyota 4Runner uses the bulb size 74 for its automatic transmission indicator across the 1984-1991 model years.
The ANSI standardization of the 74 bulb means the specification applies uniformly across the United States and Canada, ensuring consistent fitment within those markets.
The wedge base design of the 74 bulb means it is retained in its socket by the tension of the base itself rather than by a separate bayonet or screw mechanism, which is a common construction for instrument cluster bulbs.
Because the 74 bulb is a wedge type, substitution with non-wedge miniature bulbs of similar wattage is not considered interchangeable, as the socket type must match the base configuration.