- 6.6 Diesel
Good day..Vehicle info: 2008 Silverado 3500HD Dually 6.6L w Allison 1000 trans. 129,000 miles. Vehicle has a lift with the 22.5" semi wheel kit; only mentioning this in case the large tires and wheels have something to do with it. Issue: at times it has a harsh downshift from 2nd to 1st. It clunks hard when downshifting. At times it's smooth without issue. All gears up shift great 1-6. New fluid and filters. Has PPE deep trans pan. No codes being thrown. Any ideas?
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