squeal at 2200 rpm
just finished a 7690 mile 11 state trip with our 5th wheel. Total weight around 18K. My cummins engine (5.9) with 48re transmission started making a squeal when it down shifted pulling a mountain. RPM...
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Boost wont drop but noise will increase. I can also be exhaust leak but use the AV mechs KISS (Keep it Simple Stupid)
