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First things first. Are the car brakes working? Is there a trouble light on in the dash? If the fluid is an oily reddish color it may be brake fluid, in which case the car should not be driven until a repair is done. If the fluid is green or pink in color it may be coolant , in which case have the coolong system checked for leaks.
open the coolant overflow tank under the hood. if fluid is the same color, you have a coolant leak somewhere towards the front which is running along something and dripping off at the back.
if not the same color then open your washer tank and check that fluid for color match. if the same then your washer system has a leak, could be front or rear if it has rear washer
If it in fact it is the main seal you should see tranny fluid leak at the point where the engine bolts to the transmission. With car in park and brake on, start engine and carefully look under to see where the fluid is coming from. If you see no fluid leakage, place the front end (this assumes front wheel drive only) on jacks stands and block the back wheels. Have a friend start the car and with their foot on the brake place the car in drive and SLOWLY remove their foot from the brake and allow the front tires to spin (DO NOT REV ENGINE) watch for leakage as wheels turn. If you see leakage at the engine/tranny mating surfaces then yes I expect it would be your main seal. I'd take avery good look at tranny cooling lines to and from the radiator, if these leak it is very heavy.
You are correct, it's not brake fluid. Check the level in your rear axle, it sounds like you have bad seals in the axles allowing the rear differential gear oil to leak inside the brake drums. This is a heavy weight oil, 80 or 90 weight. This leakage will ruin your brake pads, and if enough leaks out, your rear differential will blow. The seals aren't expensive, but it's a lot of labor to pull everything apart to get at the seals, plus new rear brakes. My Ford ( and I'm sure your GMC) require removal of the rear axles to change the seals. Good Luck! countrycurt0