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sometimes the other switch is to cut out the cruise control when the brake is applied. I would more suspect something in the fuel injection controls such as a mass air flow sensor or throttle "switch." your car is probably too old to have an auxiliary air bypass valve but if it has one look at it as well. good luck
If the vehcile is V6,then the trans model is the A540E,and if it is the 4 cylinder engine,the trans model is an A140E.Both are 4 speed overdrive transmissions,and sorry to report that on just abot every automatic trans on the road,reverse gear failure is almost always a mechanical problem inside the transmission because there are no shift solenoids involved with reverse as with forward gears.And you did say the forward gears were fine.Good luck.