Squeal, well I'll take a wild shot at it. Wondering if you have a vaccum leak. Does all of your A/C controlls work properly, and does the cruse contol work?
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2008 Dodge 6.7 Cummins 2500 Quad 4X4 , Laramie, 12K MileMarker Winch
Sold 2000 5.9 Cummins w/ 181K, 4in exhaust, VanAkein chip, bosch injectors, K&N, gauges