A 1990 Chevy Cheyenne does
not have a transmission dipstick for checking automatic transmission fluid. The transmission fluid level is checked differently, usually via a method involving removing a specific bolt from the side of the transmission, while the engine is running. The level is determined by the fluid height coming out of that access point.
It is crucial to consult your owner's manual for the precise procedure. Improperly checking the fluid level can damage the transmission. If you don't have the owner's manual, you can often find a digital copy online through a reputable source like a GM-specific website or a Haynes/Chilton repair manual site.
