Dextron or Mercon III is what the 4L60E transmission take. Use only that..
Yes it should be!
No, Fluid, filter, and gasket
Change your transmission filter and have the trans flushed.
Have you flushed the heater core?
Yes, your fluids should be flushed every so often.
Have it cleaned out and flushed immediately
The best way is to have the tranny flushed in order to get all the fluid out of the valve body and the torque converter.
Most of the ATF will remain in the trans cooler and lines unless you have the transmission force flushed by a trans shop.
transmission oil will be dirty, blckish and more than likely smell like it is burned
GM. quit uesing Carburetors back in 1987. Everything is now fuel injected.
Car transmissions should be flushed at least once every two years, that's what most car manufactures say and mechanics
Have the vehicle towed to a transmission shop to be flushed and serviced.