According to the service manual, these are the steps to check the transmission fluid level (from p. 21-353):

1. Raise and support the vehicle.
2. Remove the transmission fill plug (1).
3. The full fluid level should be at the base of the fill plug threaded hole. If the fluid is low, check for visible transmission fluid leaks and top off the fluid level.
4. Install and tighten the fill plug (1) to 50 N·m (37 ft. lbs.).
5. Lower the vehicle.

Can you use the dipstick to conveniently check it without going through this rather involved procedure? Is there a place to insert the dipstick from the top of the engine?