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My '92 Aerostar 4.0 liter hangs in 1st gear until it gets warm. I tried replacing the modulator; however, the problem still exists. I read the archives about the governor being the problem. I dunno. Here's the deal: When I drive the van, it stays in first gear until for about 5 minutes...then it shifts. After this "warming up period", the transmission works fine.
Does this mean that the transmission is shot? Can I replace the governor? It's probably got sludge in it. I replaced the fluid and filter this summer...no problems....the van has 156k miles.