Jack Tietjen Posted May 14, 2019 Share Posted May 14, 2019 I just installed a vacuum modulator on my 1965 Buick Riv. It was shifting late and hard. When I pulled the old one out, it puked tranny fluid all over the place. It's been years since I put one in. I never put one in a early Riviera, but is it normal to get tranny fluid pouring out of the modulator hole when removing it? Thanks. Link to comment Share on other sites More sharing options...
telriv Posted May 14, 2019 Share Posted May 14, 2019 Jack, YES. About 1-1 1/2 quarts will come out give or take. IF the modulator doesn't fix the problem the next step is the governor. It could also be the governor. Remove 4 bolts from the cover on the right rear of the trans. There will be a gasket there. Best if you get one beforehand as more than likely it's leaking & may tear/rip when you take the cover off. NO fluid should come out, or very little. The governor will pull right out with a small counter clockwise twist. IF it doesn't come out twist it clockwise. Now look inside at the little valve. That should move up & down when you grab the two weights, IF you know what your looking at. Familiarize yourself by looking at a picture in the manual. Now this valve is very small & kinda hard to see because it's inside & only moves a slight amount. IF the valve doesn't move the governor is sticking & causing your problem because of debris. IF you aven't done this before refer to the chassis manual. In reality it's really simple to take apart & clean. Tom T. 1 Link to comment Share on other sites More sharing options...
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