Where do you add transmission fluid on a 1990 Isuzu trooper?

The transmission fluid is added through the dipstick tube. The dipstick tube is located on the driver's side of the engine bay, near the back. It is a black plastic tube with a yellow cap.

To add transmission fluid, remove the cap from the dipstick tube and insert a funnel. Add enough fluid to bring the level up to the "Full" mark on the dipstick. Do not overfill the transmission.

It is important to use the correct type of transmission fluid. The correct type of fluid is listed in the owner's manual.