I have a 280SE 1985. I am not sure, but when shifting through the gears (automatic), it seams like it should have four gears.....but I am only noticing three. Should there be four shifts? Also, If I accelerate very hard, it stays in the low gear until I stop and put it in reverse. Then if I shift carefully through the gears, everything is fine. Is there an adjustment that I can make and how many shifts should I notice?

Thanks
Warren

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1985 280SE