609dry

How did the muffler delete effect fuel economy?

I stumbled on this video on line from South Main Auto so I thought I’d check my truck and see if my ground strap was bad. Sure enough it was already brittle. I was able to break it in half after I pulled it off. GM engineering placed it right behind the passenger side front tire. What could go wrong . Maybe if they would have used stainless it would last but not the cheap piece of crap they did use.

I have the same problem... harsh 3-2-1 down shifts .... problem seems most prevalent on warm days 85º + with trans temp 178º - 180º...... Started around 1700 miles went away because outside temps cooled off but then returned at 2900 miles on a 91º day

I have the same problem... harsh 3-2-1 down shifts .... problem seems most prevalent on warm days 85º + with trans temp 178º - 180º...... Started around 1700 miles went away because outside temps cooled off but then returned at 2900 miles on a 91º day