What do you think is the best brand of tranny fluid?

Question

i need to change the fluid in my 99 GMC truck mercon III whats the best kind or brand

Answer 1

Any brand that indicates Dexron III, or Mercon III.  Brand is really irrevelant, as they are all made to the specifications set forth by GM, and Ford.  If not they can't be called Dexron (GM) or Mercon (Ford).

Answer 2

The best brand is the stuff it came with from the factory.  Since you have a GM vehicle, you will need Dexron III.  Brand really doesn't matter but I exclusively use Mobil products.