If it's transmission fluid, maybe the lines you see are the ones for the transmission cooler? Check both your oil and trans fluid, and find out what you're low on.
1995 Blazer LT 4x4, 4 door. 4.3L, 4L60E, np233, 3.73 G80. 300,xxx+ miles
2006 Chevrolet Cobalt LS, 2.2L, 5 speed. 214,xxx+ miles.
1973 Chevrolet Laguna, 350ci, TH-350, 2.73.
1971 Volvo P-1800E. 2.0L B20, BW-35, 4.10