2001 Dodge Neon Repair Question
Dodge Neon Transmission Problem
The two fluids are very similar but the additives are different because they do different things. It's unlikely anything will be damaged but your transmission uses a special transmission fluid with the correct additives to prevent a shudder during up-shifts and torque converter lockup. I'd probably pursue a transmission filter change and flush to be safe, but I don't think I'd lose sleep over it.
It's the brake fluid you don't want to get any hint of a petroleum product in. That can cost more to repair than a 10-year-old car is worth.
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