Standard capacity for a 727 with a stock pan is about 5 quarts.
If you are gonna change the filter and fluid go ahead and drain the convertor if it has a drain plug. It is behind the flat shield, behind the oil pan, on the transmission housing face. You may have to rotate the engine to find the small drain plug. Not all torque convertors have them today but the factory did back in 1970.
Draining the torque convertor will add between 2 and 4 quarts to the 5 above depending on the size.
I can't find a good picture but the dipstick should extend into the transmission about 3/4 of inch or so. Here is a small block tube for reference. The level for a 727 will be the same for all engine types.
The difference in a Hemi Dipstick should be the shape of the tube not the depth of the fluid.
John Kunkel is the resident Auto Transmission expert and may have better advice/pics. Good picture. I guess the question is if all dipsticks protrude past the tube the same distance. I understand '71 Hemi auto transmissions are a bunch of new and old hemi parts pulled together.
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1971 340 Challenger Conv. Flemington Speedway Pace Car, FC7
1970 340 Six Pack Callenger T/A 4-speed T8 Tan
1971 340 Challenger RT Formal Roof, EV2 w/ V2 Stripe & Orange Houndstooth
1969 Talladega Torino, 428CJ
1969 Gurney Special Cyclone Spoiler II, 351 Cleveland
"Id rather have a bottle in front of me than a frontal lobotomy" Ben Franklin 1755
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