You know the weird-looking vacuum reservoir underneath the rear package shelf? Is that only for door locks and stuff? Or is it needed for the trans to work right?

The reason I'm asking is I'm so fed up with my transmission I'm thinking of capping off every vacuum line aft of the firewall, except the ones going to the ignition switch. At least temporarily until I get my tranny shifting right.

So do I need the vac reservoir in order to have the trans modulator work correctly?

(on '81 300CD)

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'81 300CD - 180K, cannot be killed by any conventional means
'99 Ford Escort - good MPG

No.

No but enough leaks in the wrong direction could cause problems.

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42