If it's a 1/2 ton you MUST put the 4L60E back in it. The 3/4 tons use the 4L80E in them.
should be the 700R4
Dextron II fluid.
Mercon works.
The 1/2 ton will have a 4L60E transmission in it. The 3/4 ton will have a 4L80E in it.
turbo 350
80 or 85W90 gear oil.
Dexron 3.
Dextron-II jr
4L60E / 4L65E Transmission.
Should be a 700R transmission.
The proper charging kit for a 1994 Chevy s-10 is a 134a - NOT a R-12. You can purchase this charging kit from most automotive stores.
If it is an automatic, read the dipstick. It is written on the dipstick. If it is a standard tranmission, mercon works.