tranny fluid capacity

How much tranny fluid will i need if i were to change the fluid just by dropping the pan? What type of fluid id recommended for these cars?

TH2004R - approx 3 quarts, TH700R4/4L60 - approx 4 quarts. Dexron III.

how do i find out for sure which of the two i have?

TH700R4 has a rectangular shaped pan, longer front to back and the TH2004R has a somewhat rectangular-trapezoidal shaped pan with two sumps (the main sump and a smaller sump at the back in the trapezoid).

http://www.silicon212.org/pan_id.jpg

1. Aluminum Powerglide
2. TH200/200C
3. TH350/250/350C/250C/375B
4. TH400/3L80/375
5. TH2004R
6. TH700R4/4L60/4L60E
7. TH4L80E