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Old 03-12-2016, 10:10 AM   #7
plumbers crack
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Join Date: Dec 2013
Location: Ont Canada
Posts: 65
Re: What is this

I'd guess that your truck was or still is a big block. It's a vac reservoir, big blocks don't make good vac at times and need the reservoir to keep up good vac.
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1990 GMC R35 CC dually, VE cummins, 47RH
2005 Silverado ecsb, 5.3, 2/4 drop, daily work wagon
2000 Yukon xl, 5.3 all stock, wife's truck
2007 Yukon Denali, 6.2 back up truck
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