I have read in the past about some adjustments that can be made on the 92 300Ds that would make the tranny shift somewhat smoother, anyone out there know what exactly I need to adjust? When I have the windows down, I can hear what sounds like a big sucking sound right as the transmission shifts, so i am thinking it is a vacuum problem?

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1996 E300 D
1992 300D
1990 Ford E-350 7.3 Diesel AKA "the Deep Fryer"