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2005 Astro downshifting when it shouldn't
My Wife's 2005 Astro Van with 48 K miles on it, has recently started to downshift when it shouldn't. It mostly happens while accelerating at lower speeds....It will either shift down when it should shift up, or it will shift down during slow acceleration with no additional input from the gas pedal. It will also do this at highway speeds...shift into overdrive while cruising for no apparent reason. I'm hoping this may in fact just be an electronic issue. We have extended warranty insurance, and it may be covered, but I'm sure the deductible will be a little high. Would I just be better off having the tranny serviced and getting an estimate at a local transmission shop?
Again, thanks for any help or suggestions.