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why doesn't my 94 olds 3.8 ltr shift into drive or od?

My 94 olds 88 3.8 ltr. doesn't want to shift into Drive or OD. it will still go down the road at sixty and shift into passingggear. It wants to jerk at speeds of 45 or more but will smooth out at times or at least not so bad, Why? Could this be a speed sensor or another sensor ot tranny problem . IT HAS 165k AND DON'T KNOW ABOUT SERVICE RECORD.
pHIL, January 2008
Check the level of the oil in the transmission, if the car you are describing has an automatic transmission it could have low transmission fluid when pressure is building up for the speed. It works off a wet clutch and if the drive plates get dry they don't work = Brian

Brian Guy, January 2008
link Click here to see other fixes for Oldsmobile 88.