Quote Originally Posted by tlray View Post
Went to my local Autozone and couldn't find Type 4 trans fluid for GM. Is Dexan 3 the same?
The difference is that Dexron III is not synthetic and Dex IV is partially synthetic - and Dex IV costs more. Either one will work, because the transaxle was originally designed to use Dexron III. Theoretically the synthetic version should last longer. The important thing is that having clean fluid in your tranny is better protection against transmission failure than leaving dirty, worn fluid unchanged.

If you want the most economical replacement for Dex IV it is the Valvoline version of Dex IV, when bought by the gallon (click here)