There will be transmission fluid coming out of it, they arent that much to replace (20.00) if it does need replaced. Take the vacuum line off and see if it shifts different. If the transmission is a th400 the modulator valve should be on the passenger side where the transmission cooler lines are, right above the pan.
If you need a picture I can post one.
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1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73
1992 Camaro RS 305 TBI
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