Hey guys new to the site and ive looked around and still havent found a solution i recently bought a 2014 crew cab lt 5.3l chevy silverado with 63,000. I bought the Range afm to disable v4 mode and my transmission slips from 1-2 then has like half the power from 2-3 at cold or hot doesnt matter. Then drive fine after 3rd gear. i just recently flushed my transmission and changed the filter but still no luck... dealer said they cant find anything... plz help