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Old 03-05-2000, 06:18 PM
Registered User
Join Date: Apr 1999
Location: Apex, NC USA
Posts: 176
When slowly accelerating the transmision isn't as smooth as when accelerating more rapidly.

Can this be adjusted? The service CD haas no info on trans or I haven't found it yet.

1991 350 SDL
114,000 miles

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Old 03-05-2000, 07:06 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
There are several vacuum controls on 1991 350SDL for transmission control. Many times even "trained" technicians have problems w/these control adjustments.
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Old 03-05-2000, 08:26 PM
Posts: n/a
Suggest you try adjusting the modulator. It is a vac. control on the driver side of the transmission. You can find it by looking for a black plastic vac. line that is attached and also look for a plastic part that has a small rubber cap on it. Pry the cap off and there will be slots visable, in the slots will be a "key". Pull the key out far enough to bypass the slots and try adjusting it in or out 1/2 turn at a time. Turning in will be a harder shift, turning out will be a softer shift. The shift should be firm but not so hard that you feel a distinct jerk.

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Old 03-06-2000, 02:58 AM
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Join Date: Feb 2000
Location: Philippines
Posts: 157
Same problem here. Have an 85' 300D 124.
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Old 03-06-2000, 08:49 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I have seen a small yet informative section in the cd's uder the engine section. You have to dig to find it. It gives the vaccum lay out and what the different pieces do.

1981 280GE SWB
1987 16V

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