what vacuum lines on my 1979 GMC Sierra affect my transmission's

lloydb

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operation? My idle is high& trans slips bad.? actually i changed modulators already and it seems worse than before ,this started after i replaced the u-joints and while down there i saw the cross member was loose that supports the trans so i tightened it and that was it. is this maybe a vacuum that is leaking?
thanks bob -and a merry christmas to you too!
 
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