1987 Pontiac Fiero - Transmission Fluid and Filter Change DIY
Basic Car Maintenance of draining, cleaning, installing, and replacing the transmission fluid and filter of your 3T40 transmission, otherwise known as a Turbo-Hydromatic 125C or Turbo125C. I use Valvoline Max transmission fluid and Napa replacement parts. Should work for all Pontiac Fieros, both Duke 4 cyl and 2.8L V6's.

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