Posted by matthewh on August 05, 2008 at 18:42:11 from (24.181.75.127):
OT as I have an older work truck which I can use to pull me and my junk around fine. Problem is I bought a four door chevy with 6.0l gas to haul may family and small camper camping. All was fairly well even after we upgraded to a much larger camper. It was loaded, but I could hit the Interstate and run at a very good speed and it would not excessivly shift out of overdrive if I pushed it reasonably. The thing is, my muffler went bad and I replaced it with a Flowmaster. Ever since it sure seems like I lost any margin I had and it drops out of overdrive on grades I use to think I could pull in OD. In all fairness, it could be my imagination and or the fact that the recent trips have been longer and we have loaded everything we own including the kitchen sink.
What do you think, could I have really lost noticeable low/midrange torque by switching to a low back pressure muffler designed to increased horsepower? Also considering 410 rear versus 373, thoughts here?
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