Where is the other end of the modulator vacuum line hooked to? Should be to the intake manifold. If you pull the line off the mod, it should have vacuum. Also, you may have the wrong mod in there. I'm not sure how many different ones are available for the TH350.
Hopefully you didn't miss putting one of the little balls in the valve body...
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1971 GMC 2500, 402/TH400 4.10 Daily Driver
Lafayette, CO
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