Chevrolet Uplander front and rear turn signal bulbs utilize 3157NA and 3157 bulb sizes respectively. The replacement chart contains specifications covering 2005 through 2008 model years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Chevrolet Uplander uses the 3157NA bulb for the front turn signal across the 2005-2008 model years.
The rear turn signal on the Uplander uses the 3157 bulb across the same 2005-2008 model year span.
Both the 3157NA and 3157 are dual-filament bulbs, meaning each unit contains two separate filaments operating at different wattages within a single housing.
Both bulbs operate on a 12-volt electrical system and share identical wattage ratings of 27W on the high filament and 7W on the low filament.
The T25 designation refers to the wedge-style base type common to both bulbs, indicating they share the same physical base and socket fitment.
Both bulbs conform to ANSI standards applicable in the United States and Canada.
The 3157NA differs from the 3157 in that its glass envelope is tinted natural amber, which produces an amber-colored output without relying on an amber-colored lens.
Because the 3157NA is specified for the front position, the natural amber tint is likely paired with a clear or non-amber front lens housing on the Uplander.
The 3157 used at the rear position has a clear glass envelope, with any amber output at that position dependent on the lens or reflector housing rather than the bulb itself.
Although the 3157 and 3157NA share the same base type and electrical ratings, substituting one for the other at either position may affect the color output of the turn signal as seen from outside the vehicle.