JLT-SSS Posted November 24, 2021 Report Share Posted November 24, 2021 Hey all, I bought an '03 AWD Silverado SS about a month ago. Only 136,000 miles for $12k and she runs great, or at least did. Trying to figure out if my recent muffler delete is causing the trans to have mushy shifts. It was a home hacksaw job from a buddy of mine just for fun but I've never had issues with muffler deletes in the past. I'm taking it to get a Flowmaster Super 40 or 44 put on next week hoping that solves the issue. Has anyone else ever encountered this? Would lack of back pressure on the LQ9 make a torque difference? Quote Link to comment Share on other sites More sharing options...
dcairns Posted November 24, 2021 Report Share Posted November 24, 2021 Did your hack saw hit any wires for the transmission? Quote Link to comment Share on other sites More sharing options...
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