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Finally drove my 48 club coupe with the M6 transmission. It was working well with smooth almost imperceptible up shifts. I drove about 3 miles and turned around for the ride home. Then it hung in low and didn't up shift. I released the gas pedal again and then it shifted. It did this twice. My father had a Dodge with the M6 transmissions and I remember him opening a panel on the transmission hump and cleaning something. I was a kid of about 10 and didn't understand what he did. But after he worked on it the up shift would be really crisp. What did he clean that would do that? What else should I check to make it up shift?
Jim...also posting this on your behalf in the regular discussion page. Please check there as well for a response. I recall reading others cleaning something on this transmission to improve performance. Hopefully someone will respond.
Mark
