The Powerglide transmission system, which was designed by General Motors, was commonly used in cars in the 1950s to 1970s. Today you can find it in drag-racing cars because of the strength of the gearbox. Checking fluid levels in a Powerglide transmission requires the engine to be warm, so you can check the fluid after a drive or by running the car on idle for a few minutes. Overfilling transmission fluid can lead to low-operating pressures and damage, so you should observe exact fluid levels. You will need to purchase the correct transmission fluid for your vehicle.
Park the vehicle on a level surface. Make sure the vehicle is in park.
Turn on the engine and let it idle for a few minutes, if it's not already warmed up.
Open the hood and clean off dirt around the transmission dipstick with a cloth. The transmission dipstick is usually located near the transmission. On many vehicles, you'll have to reach down a bit to grab the dipstick. Wear protective gloves if necessary.
Remove the dipstick and wipe it clean with a cloth.
Switch off the engine and insert the dipstick back into the casing.
Remove the dipstick and check the fluid level. The right level will be reached when the fluid reaches the "Full" mark on the dipstick.
Place a transmission funnel in the transmission fluid aperture and pour in some fluid.
Remove the funnel and replace the dipstick in the aperture.
Remove the dipstick and check fluid levels, wiping off with a cloth.
Repeat this procedure until the fluid reaches the "Full" mark on the dipstick.
