Hissing Sound?
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Joined: Dec 2003
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From: Western NY
Hissing Sound?
I towed my 10Klbs 5ver this weekend for the first time after my mods: DP, BTS VB, Gauges, 6637 & muffler delete. I have noticed that when the truck shifts into OD when not towing there is a hissing sound (not loud), which I'm pretty sure is coming from the 6637 (truck pulling alot of air) but it goes away once it is up tp speed. This weekend I noticed that when the truck shifted into OD (DP 60 tow setting) the hissing sound was more pronounced and did not go away until my speed got above 65mph or so. I think this is normal but just wanted to make sure. BTW the truck pulls the trailer really well and the mods all interact great to make a great towing experience. Thanks in advance for your advice.
Greg Calkins
Greg Calkins
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