1990 Mazda b2200

Transmission problem
1990 Mazda b2200 4 cyl Two Wheel Drive Automatic

I have a b2200 one owner vehicle. Well maintained. Bought from older gent. Truck drives through all gears even reverse goes forward whats that about and how do I fix it. When put in rev it goes forward. Should I do tranny and filter flush with a bottle of lucas for cheapest fix trans fluid is black. Some say its an electronic control box on top of tranny hheeeelllp
July 22, 2008.

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